I have a few quests left to, forfilled let's say 6 or 7 quests and also did a few sidequests. I have found a few towns and villages, now problem so far. But when i mark the next quest and go there, everyone keeps on attacking me, everywhere i go its the same thing. Why is that ? Can anyone help me? Thx

Are you a vampire? Do you have a bounty in the places you go? Are those people attacking you supposed to be friendly?

I do have vampire blood but i don't know how to get undo this? And how can you see if there's a bounty on your head ,

Looks like you're a level 4 vampire, which means that NPC's will attack you on site. If you want to stay a vampire, but don't want to be attacked, you have to feed on dead bodies, which will set your vampire level to 1, where you won't be attacked (only level 4's get attacked). To get rid of your vampirism permanently you have to do a quest. To check your bounty you have to go to stats in the menu.

The quest you have to complete to cure vampirism is in morthal. First talk to bartenders and ask about rumors, they'll tell you about Falion in Morthal. Go to him and you'll have to complete a quest to cure yourself. To do this you need a filled soul gem and to complete a ritual with him.

Ok first i go seek some dead bodies and have my meal . Then i go to morthal to get and try to undo this.THX so far

No problem, but remember, you may have a bounty in some holds. It is best just to pay them off.