Hey, I'm probably the closest to your age on this site (19) and I am fresh out of high school by about a year.
TRUST ME when I tell you this: how your high school peers think of you will be meaningless once you graduate. Come out now if you want, because even if you do get negative feedback from kids in your school, who cares? You'll never see them again.
I didn't come out until after high school because I was afraid of this very same thing (mean kids giving me hell), and now I only see them bagging my groceries.
Sure, right now that kid might be the bully, but when high school is over, reality redistributes the power, and from my own experiences, that redistribution is very, very fruitful.