Sorry, but I don't have any advice on how to make your parents come around, however, I can offer some suggestions to help you navigate the next couple of years you still have to live with them.

Surround yourself with people and counselors and support groups that are accepting of you exactly as you are ... These will be the people who will be there for you when you do finally come out to them regardless of what the fallout may be.

Who knows, your parents may change their point of view once they realize they may lose you if they don't, but unfortunately that may not end up being the reality and you've got to have a good support network to help you through that rejection if it comes down to that!

Hoping & Wishing The Best For You!

Sincerely,
Pfrog!