Horseygirl,
You have a lot of issues here and this board is probably not the best place for you right now. Being a JW and being home schooled is not ideal, but you do have to live by your parents rules for now. The cutting is a sign of bigger mental issues, you need to talk to your doctor about the cutiing and not wanting to be a JW. Say you feel isolated being home schooled.
Being gay is fine, your parents need to accept this, if they don't you can tell your doctor.
Go to the doctor by yourself and explain all of this to them.
Please stop cutting yourself and don't do anything silly. You have made the first move by comming here, now go to the doctor.
Kate xx