No not many people IRL know
Even though I know you're a 'he', and I always refer to you as 'she', to me there has never been an issue. You'd be a great mate, even if we met IRL.
If your parents have a problem, then they will have to sort it out. Your life is more important in the long run, and sod everyone who doesn't like it.
You give me advice which I should take more often, and I try to. It's much appreciated. Don't take any shit, Soph. You are who you are.