How to deal with Homophobic people

So what's been going on is someone told someone that I'm gay but now I'm getting bullied for it . I don't know what to do. I want to go to the mentor, but I don't want to because it is hard for me to one go on my own and also why. He would want to know what he was doing. I just don't know what to do. I know I should tell but I don't want to make it worse. Please can someone tell me what to do.