Im tierd of being in the closet

Im 18 now and i know i had doughts about my sexuality since 14 its been rough, i had came out to 2 people yet, but i still feel lonely, im also with a pretty homophobic class, theres not super homophobic but they sure dont care about lgbt discrimination either, there also super right wing and associate the lgbt community with the left and there for hate it, i am also left wing and took quite alot of undeserve shit for it, i wanna be more aggressive towards it, and to stand up for what i believe in, also i need to mention that my bible teacher is also homophobic, and it aslo makes me feel traped i dont know what to do