Hello, Jellyfish. I really can't say I understand what's happening either. If I were you, then I think I'd at least ask the folks to explain why they seem to be rather two-faced.
It might partly be your goody-two-shoes reputation, but if it is, then I encourage you to stand your ground. We need people who study hard, and who have important goals and values in this world. It will pay off one of these days.
If you wish to continue this conversation, then feel free. I will check back before too long--maybe tomorrow.
P.S. You might consider talking to a school counselor about things.