Hi m_agirl04 and welcome:
I'm sorry that your parents have caused you enough harm that you want to divorce them and wish worse on them. I don't think it's a bit selfish......I think it's surviving as best you can, which is the best anyone can do.
As to others who comment on your decision, maybe you could say something like:
"I'm not in contact with them anymore" and if there are further questions, "Oh, we don't get along", and leave it at that.
Since I have taken this step I have been extremely sensitive about being called crazy, the "issues queen" etc. etc. Considering I have asked people not to do this, it seems abusive but I don't know how to blow it off.
If people are calling you "crazy" and have even given you a name....."the issues queen"......those people are being abusive. Who wouldn't be sensitive about that? Only someone who tolerates abuse well.
Maybe, the best thing would be to distance yourself from the people who are saying these things? If that is not possible, then maybe the next time they insult you, you could respond with something like:
"That's abusive" (while squashing your eyebrows together and shaking your finger at them)
or maybe saying: "You can't be serious!!" (while lifting one eyebrow, smiling cutely and laughing sweetly).
Lately I have had spells of feeling like I am losing it, and that scares me.
Maybe, once you put some distance between yourself and those who are trying to convince you that you're the nutbar of the group, you'll feel less fear and on a more comfortable, relieved level???
Please remind yourself that you deserve to be treated with respect. I admire you for taking steps to get away from those who don't get that.

Sela