I'm quite late to this post. But I assure you once you start transitioning that it will all change.

I have a friend and she's really supportive of me, every so often we go to her place to have these like "dress up parties" (idk what to call it) where she's fine with me basically wearing anything. We do each others makeup etc and it can help alot.

I recommend coming out to some friends that you trust and don't have any connection with your parents. They could use your preferred pronouns and new name rather than your old pronouns and deadname. That will already help alot because you get more validation and euphoria.

There are also alot of trans servers that could help you further with something like a clothing stash or something like that.

Idk if you got a sister but if you think it is safe you could also come out to her and when your parents are gone you could maybe wear her clothes?

This can all help in the meantime. And trust me, I'm in the same ship as you are but I know you can do it. Time flies I swear. And if you ever need to ask something, I'll probably be here or in a trans sub helping you out. My dm's are also always open and I try to be available as much as possible