Listen, since you know ttatt what would be the point of making false " friends" that will drop you like a hot potato as soon as you stop attending - save yourself the heartache of getting close to folks who are going to hurt you. Please try as best you can to forge bounds with normal kids at school or community college or neighbours. Start preparing your social network NOW. You're gonna need em.
As to your parents, the only way baptism would be useful is if you intend to move away andfade. However your parents don't sound like the types to stick to the letter of JW law but not the spirit, if they know you have faded they will shun u anyways so it seems utterly pointless. I think u should play the " I have doubts - help me" card. Make like you cannot dedicate till your 100 % convinced and that science lessons/ evolution has stumbled you. You will have to suffer more study with them but from what I know baptism has never helped anyone who knows ttatt in the long run. You are not your aunt, you are their SON....you never know,start preparing them now. If u don't get baptised they don't HAVE to shun you..are u their only child?