I had my life ruined because I stood up against an undeniable injustice when I was a teenager, and was met with severe gaslighting and humiliation. I am almost 30 and still haven't recovered from the damage, and I never will. I will never forgive those who wronged me, much as I might want to.

Being the only one who sees or acknowledges something wrong changes the way you see other people; it can be isolating, even if the conversation is about something else. I hope you have at least one person in your life who you can have a private conversation with. If your friends don't fit the bill, is therapy an option? A therapist has to listen, even if they disagree (though some are irrational and unprofessional around this topic, in my experience).

I would say bide your time. You are a teenager: it's not your job to stand up to injustice. That's for us adults to do. Please just take care of yourself first. I know it's hard, especially when your parents homophobic. But you matter more than the sloppy opinions of a handful of teenagers and your parents.