I need to be feel happy again, PLEASE HELP!!!!?!

I used to be happy as a teen, had a great childhood, great friends, & parents too. but then I got backstabbed/hurt by my 2 best friends for no reason, I think its jealous & I was really hurt by it because I'm really a sensitive person, then I lost 7 other friends over a big fight at school & everything started going down hill from there. I'm really not a bad guy, I'm kind, funny, helpful, very charming but I don't know why this is happening to me? every since then I can't feel happy or maybe I get scared to, thinking someone will come & take it away from me all over again. The feeling of happiness to me was a very cold feeling upon my heart & chest which was a very good feeling & I really miss it!! I want it back its been more than 5 years now & I'm still struggling to bring it back, I tried absolute everything to do so, going to the gym, working, writing, reading books, I even stopped smoking & I still feel bad. I want a serious advice that does not include drugs. please help! thanks for your time.