How to deal with going from loving MMA and life to hating everything.?

I use to be this happy person who loved sports, MMA, Jujitsu, Marshall arts, Combat sports, out door stuff and anything related . I also use to be a happy person where nothing bothered me and I expected everyone for who they where. But it all change last year when all bullying and having sensitive parents take a tool on me. I use to train with this guy who drove me crazy along with some of his friends . I quit everything I liked because of him . He use to fallow me to one mma training center to the next . Then I believe most of it was the Facebook drama where I got in to miss understanding because I trusted the wrong people and acted out of Emotion. I dont know what to do any Moore . I would really appreciate some advice