Tough but the best advice I can give you is be yourself. True, a little subtlty and secrecy doesn't hurt especially in high school, but be who you are and don't listen to other people because they don't matter. It's hard [I know] but in life you need to grow a shell to deflect taunting and negativity.
I don't exactly know your problem, but meditate, center/ground yourself and yes, prayer to help you find the answer. I don't understand why your coven turned against you though, that's what confuses me the most, but you don't need a coven, this path is personal so you can learn on your own. Some people feel held back in covens.