How can I make new friends?

I use to be a thug i guess i hung out with gangsters i was nothing but a common criminal after spending time in jail( one of my "friends" ratted on me for selling weed to get himself out of trouble) i realized how F&#*ING stupid i was i see how those people i hung around with influenced me and stabbed me in the back i have a reputation for fighting and stuff but i want friends that are worth keeping im done with the gangsta lifestyle but i can see cuz of my rep how no decent person would want me as a friend.... advice?