You should just go for it and tell him. You don't want to look back and regret never doing it. Just come right out and say it. You won't get things from waiting around; in life, you have to chase the things you want.
I get it, trust me. I recently told the guy I like how I feel. It's really a relief once it's out, and if he cares, he won't let his friends mess with you. You should just go for it! What are they going to make fun of you for? Being human and having feelings? Don't stress. Just do it. You'll be great, and you'll do fine, and he'll at least appreciate the honesty.
Ahh, I'm sorry. They're not really worth it though, ya know? I wish I could relate, but honestly I don't go to public school and I have never really had someone bully me who I didn't fight back at.