Help and give me some hints?

so i have been acting in movies and theaters a lot but most of my characters is a bad guy (selfish, condescending, exploitive, ideal mean person) my characters usually ends up in jail, mental hospital or dead....so i really got used to being the evil guy...but then i got an offer and my character this time is the main character and a good person and i dont think i am able to do it since its something different for me...so i just want u guys to give me a movie which has this decription of character (loner, anti social, always quite in the group of friends, yet he is helpful, he is physical strong) but he is not schizophrenic...so is there such a character u saw in a movie that has the same description? thanks