I'm SO so so sorry to hear what you're going through, but at the same time, I'd like to thank you for sharing your story and being able to inspire girls not to tan.
As a very pale girl, I've ALWAYS been picked on for not being tan. I've tried tanning beds, laying out, etc. just so people would be comfortable with my skin color (but I don't tan so it didn't even help after a ton of effort) but now I'm just like so what! I'm pale, big deal. Like you said, at least I'm not damaging my skin or raising my risk for cancer! That's dumb. And if I ever do want to tan, I can just spray tan. It's safer and worth the extra effort/cost/whatever. Anyhow, I really hope your situation improves and soon! <3