Hi Antisocialbutterfly: You received some top-notch insight from Grey Matter. So I won't even attempt to cover any of that territory! But I just thought I'd chime in & second what you said about your age & your living situation with your parents. I'm long since past that now. But I can still remember what a struggle it was to keep my gender identity disorder a secret. My parents both died never knowing the story & I'm sure they went to their graves wondering what happened.
It takes time to work through these types of concerns. A qualified & experienced gender therapist can be of benefit if & when you can find one & arrange to see them. The good thing is that, at your age, you have time. You don't have to work it out all at once. Just take it a step at a time. Rest there for a bit & then move on. As the saying goes: "It gets better..."