You're simply too low leveled... by level 8 you won't have gotten high in any of the skill trees, and won't have gotten any good equipment. You won't really be able to face anything harder than a couple lightly-armored bandits, much less a dungeon boss...
Level up your smithing, craft some good armor and items, go do some other quests to level up your combat skills, then go back and mop the floor with the boss's face...

Or you could turn down the difficulty for the boss... you know, Bethesda did a very sloppy job in some parts of the balancing, and you could easily face a stupidly easy group of enemies in one room, and in the very next there could be a single enemy -even of the same type- that is broken-difficult...
The boss at Bleak Falls Barrow (I assume you run into that one) is indeed very hard - I cleared the rest of the dungeon on expert once, but after 6 deaths I decided to turn it down to novice just to get it over with and move on... No shame fiddling with the settings...
Oh, and in case you're playing a destruction mage: either cheat-level it or quit it while you still can - it's broken. With most of my perks into destro, it leveled to around 40 and on apprentice... the only way to actually kill anything harder than a skeleton or a lowly draugr was... to charge in with dual bound swords, screaming "Victory or Sovngard!!!" =_= It only gets -mildly- acceptable past mid-game...

That happened to me about 3 times, where I had to go back and deal with the boss 3, 4, 5, or more times before I beat him. Heck, when I encountered my first Dragon Priest, I tried to kill him (with a follower and being around 20th level) somewhere in the neighborhood of 8-10 times, failing and dying each time. Left him alone for a while, went back when I was around 40th level, destroyed him and took very little damage doing so. I think it was a bit anti-climactic, but I was OK with it.

unless you spam the impact perk

That's why I said "past mid-level"
And still only mildly acceptable, since by the time you're done with all the enemies as a destro mage, a sneak archer will have one-shotted this and the next two rooms without anyone even finding them out before they drop dead (with an arrow in the skull)...

Thats why I invested in one handed as well

I disagree I do not think it is too difficuld.

I beat that Boss without changing the difficould.
I don′t like the feature to turn up/down the difficould.
My choice was to play on "normal",and then I expect it′s possible to complete the game on that setting,without any changing.
But ok,I understand that in this game it′s not allways possible to win on your current level.

I agree changing the difficulty mid game is CHEATING!

The best way to beat stuff that is too tough is "kiting", i.e. running away while attacking. I had a battle with a Falmer boss where I ran through the entire dungeon and back again three times. I used to kill Chaurus by hiding in Falmer huts and closing the door. There is always a way to beat anything if you try hard enough, at least that is my experience.

Thats a dificult answer, i cant answer it cause i have no trouble with the combat, that makes me a hardcoe player.

I wonder why the others have made helping comments as he didnt want help from the more hardcoe players, and we all are more hardcoe then the OP.

If you're not looking for help, why are you posting here...?
Unlike Oblivion, Skyrim is not completely level-scaled. If an enemy is too tough, go level up and return later. Or use the difficulty slider. You might not want to, but if it's your only option then do it. It's not cheating, and you can turn it back after defeating the mob if you wish.

Btw, you have a very nice taste in games. The Elder Scrolls is, apart from a fantastic game series story-wise, a great way to learn English! Being Scandinavian myself, and dare I say hardly much older than you, I have found that I have learnt far more English playing Elder Scrolls than I ever have at school.

I think it would svck and break the immersion if you were able to defeat everything on level 1.

Just lower the difficulty if to level up is no option for you.

I guess it was too difficult to even spell "difficult" correctly.

Is someone going to punish him for it? I am not ashamed to admit I have lowered the difficulty to novice once.

cut him a break, he says English is not his first language (danish)

If it helps any, I initially had trouble with Falmer when I first encountered them. As a melee character, I'd get flanked and swarmed and then it would be all over. So, I left the area and worked on my tactics:

1. Potions. Started making as many as I could, like Damage Health and acquired Poisons
2. Brought a Follower. Find one that compliments your skill set - if you're a close combat Warrior, find a Follower that offers ranged support or vice versa.
3. Worked out a better strategy for combat, such as starting combat with a bow/staff and then switching back to a close combat weapon after the first shot.

At some point the game does get alot easier. Once you get better at crafting materials, whether it's weapons, armor, potions, etc, you'll find that your gear trumps everyone else's.

I didn't use crafting on smithing at all (on expert) and the game eventually got easier for me.

Are you in faldur's tooth?.that place was extemely hard to get in to with all those bandit murauders.

Last time I checked there was an option to change the difficulty.
If you're not good enough just make it easier. You can't complain about the game being too hard unless you are on the easiest difficulty setting.

Have you thought about, I don't know, leaving and coming back later when you're stronger?

I know I have several dungeons/quests that I have to wait for a while - it's not like there's nothing else to do.

Open the console command with ~

Click on the enemy.

Type in the word "kill"

Press enter, then ~ again.

Problem solved.

Feisty one you are!

Try dodging and not getting hit? Moving forward to bait them to attacking then attacking them when they can't defend themselves then backing up again is a simple and very effective way of defeating tough opponents.

Just rinse and repeat

I suggest you stay away from the bosses until you have most of the skills/perks you need, if your level eight, than the bosses either have 2-4 times more health than you do, and can inflict great amounts of damage, especially the bosses who are highly skilled in Destruction and Two-Handed weapons.