I'm sorry you're going through this
I would almost bet money that your parents regret not being there for your sister and that they would be more understanding with your situation. You are also younger, they can't just toss you out.
Maybe it would help to have a third party there with you when you tell them, an aunt, cousin, friend of the family that you trust?
You will get through this, and we're all here to listen. Whatever you decide to do, you have lots of support here!
