I get teased or backbit-ed for being gay?

Im straight but I have this feminine accent and my friends(sort of) would make funny gestures or back bite me.. coz sometimes Im not aware of my voice... is there any way that I would change? and they think I like guys!? If I would look for my other male classmate coz were only few they would make funny gestures... it bothers me... is there any I can change?