I hang out with some stoners, some drinkers, some fighters and some total badasses, but don't acctually want to. But I got their reputation, and now no one else will hang. How do I get rid of my bad rap. I'm not like them!

First, stop hanging around them.

Is there any reason, other than you hung out with them, that you have a bad rep?
Try stop wearing their recognized clothing, don't use their slang (habits, hard, but doable), don't go to their frequented places, etc.
Basically, disassociate yourself from those groups.

Try to start making a new name for yourself. You can't do it instantly. It will take time, but it will be worth it as you will be able to continue your life away from their influence.

'and an angel of mercy to see me through all my sins'
Good song.

Its difficult to change a reputation,the easiest thing to do is not being available when they call.

If you have a hobbie or interest you could get more involved there,meeting other people who don't know you is a place to start.

Be who you want to be,make a stand for yourself,it takes courage and grit,but you can do it.

"Birds of a feather flock together"

Whats more important, your rep? Or who you are?

You must not know who you are, if your letting your rep define you.

I know who I am. That's why I want a different group. But my rep from hanging around them people gets in the way

It wouldn't get in the way unless you let it.
Get away from those people, and stop associating with them.

You will have positive rep catch up with you if you hang around the people and do the things that WILL give you positive rep.

Where are you hearing you have bad rep from anyway?
I doubt that everyone around knows you, and it's just the people you currently hang around you telling you this so you can't leave.

If you know who you are, why does it matter what others think?