I guess you're in the same position as me, then: you want to change how you're being treated, but fear of rejection and being isolated are holding you back. Now here's a story:
I found out someone's true colours by telling them something (it was the name of the girl I liked). They were supposed to be my best friend, but no, they instantly told everyone and she knew within the next day. I got revenge by telling the girl he liked that he felt that way towards her, and then the slimy toad threatened to kill me. Apparently, my friends all tell me to let it go because it wasn't serious, though; I'm living in fear of my life, and I have been for two months. The torture he has brought upon me is unbearable, even though he was supposed to be a friend.
Maybe you could try the same; see how quickly it takes for someone to spread one of your secrets. It doesn't need to be a real secret, but the key to working out what type of person they are is to watch how they react to your retaliation. If you make up instantaneously or very soon after, then you'rte porbably good friends. If they lie about you, spread more rumours and threaten to kill you, they're a toxic person whom you shouldn't even want to breathe the same air as. The person's done that to me twice, but once I was too young to harbour any resentment; don't let that happen to you, and DON'T LET A SINGLE SOUL THREATEN YOU OR MAKE YOU FEEL UNCOMFORTABLE FOR SUCH A CHILDISH REASON!
There we go, rant-advice over.