Are you serious? If you have done nothing to provoke this, then take a fucking bat to his face. Jeez...no way I would ever let anyone bully me, even if they were bigger then me.
Many years ago (15) when I was a freshman in high school, I was being bullied by a junior, who was much bigger then me. We were in the weight room for gym class, and he started to mess with me. I fought back. It ended up being broken up, and nothing happened.
Three weeks go by, with not a word said between the two of us. I was ignoring him, he was ignoring me.
Up until one day. I was standing by my gym locker getting dressed. I was facing my locker, when I felt someone tap me on the shoulder. I didn't even get a chance to turn my face completely around when I got blindsided by a massive sucker punch. I got socked right in the eye...... real hard. It knocked me to the ground, I got up in a rage of anger and football tackled him into the lockers. He fell down to the ground, got on top of him and started to drop bombs on his chin. He got KO'D on the 2nd or 3rd punch, but I kept on going because I was soooooo pissed and angry. The locker room attendant ended up pulling me off his limp body. My entire eyeball was blood red for months, and I had such a bad shiner that my whole eye ended up completely swollen shut.
Get this....I get suspended from school for a week for defending my self. According to the dean, after I got punched in the face, I should have got up and walked away and told a teacher.
Wow, that was a long time ago. I feel old now.
Man the fuck up. Next time he comes up to you be ready. Are you right handed or left handed? Assuming your right handed, stand with your left foot forward. Make sure your standing facing sideways...kinda like a snowboard stance, with your left foot forward. When he comes up to you, make a fist as hard as you can while keeping it hidden behind your self so he can't see. Time it right....when he comes within an arms length of you, reach back and throw a haymaker right at the point of his chin. Just focus on his chin, and swinging as quickly as possible. I know he wont be expecting it, and if you connect on the point of his chin (its called the button) he will be sleeping like a baby.
I don't care how big or small you are, anyone who gets hit hard enough on the button will go night night. I saw a female hit a dude on the chin and we had to get smelling salts to wake his ass up.
It will never happen again if you do this.