Like others have said, you seem to completely have neglected your defence.

You also don't seem to have any support skills.
Alteration is okay, but it will take time to level up and isn't that good for going toe to toe.
Start by levelling up Heavy Armor, Blacksmithing, and enchanting. You don't even have to max them right away, just get started on them, and dump some points in their perk trees as you go along.
here's a guide on levelling Smithing/Enchanting:
http://www.gamesas.com/topic/1274813-leveling-enchanting/page__view__findpost__p__19289283
You can buy soulgems from the trainers at the Mages guild, and every Jarl has a court mage that sells them too. Don't worry about costs, just use Petty and Lesser gems, you'll make your money back when you sell off the items you've made.
Put on some Heavy Armor, get a Soultrap weapon (If you enchant a dagger yourself you can always carry it with you since it won't weigh much), and go and find mudcrabs and wolves. Let them beat on you a while to level Heavy armor, then kill them and trap their souls. Use the wolf hides for leather. (Turn the difficulty down for this. They'll do less damage and you can let them hit you for longer that way

)
While you are levelling your skills, tag the Standing Stone for that skill: The Warrior for levelling Heavy Armor/Smithing, the Mage for Enchanting. It will go faster that way.
Use your Smithing to make yourself a nice set of armor. At level 25 upgraded Orcish or Ebony should be fine. Blacksmiths should sell ore, but you can also gather it yourself. A list of ore locations:
http://www.gamesas.com/topic/1266008-places-to-mine-ore/page__view__findpost__p__19217842
If you don't have enough Stamina to carry your Heavy armor and some loot, tag the The Steed Stone Northwest of Solitude once your crafting is done, it means you do not suffer a speed loss from wearing armor, +100 Carry Weight, Equipped armor is weightless.
Enchant your chest, helmet, ring and amulet with destruction magic cost reduction, the rest is up to you. Don't worry about Magicka regen, since it won't regen in combat anyway. Use Grand Soul gems for this since they give the highest number. The best way to get these is to buy them prefilled from a merchant.
Make yourself a good weapon. The best quality you can make, upgrade as high as possible, and enchant it with extra damage. If it runs out of charge recharge it with a soulgem. Always carry some extra gems with you for this purpose.
This should turn you into a bit more of a battlemage, with some higher defence. Eventually you'll want to max out Enchanting to get the option to put two enchants on every piece of gear,
and you'll want to max out smithing to improve your gear as much as possible.