Sometimes I will masturbate to pictures of my classmates, what do you think about that?
Are you joking right now? Do you really do that?
It's just a small thing to do when I'm in class, it helps me relax.
You shouldn't do that to your classmates. It's violating to do things like that to other students without consent, and it can lead to unhealthy thoughts of people you are in close contact with.
I'm very average, how is masturbating to my classmates weird?
It would make your classmates uncomfortable, and most of them would feel violated if they found out. It would also be hurtful to you if they started avoiding you because they thought you were creepy. You should find healthy outlets for sexual feelings.