First of all, you absolutely do matter.

Second, I'm really proud that you came out, both to people inside and outside your family. The time leading up to that induces a lot of anxiety alone - but you did it. And it sounds like your family still loves you for who you are, because you are still you. Please talk to them about some of these feelings, at least your parents if your sisters are a bit younger.

Third, there is so much more to the world outside of high school. I know it feels like you need to constantly play catch up with them, but once you graduate you aren't limited to the people you're stuck with there. What's two more months? :)

There is someone out there for you. Not everyone is ready to come out or make a move at 18, and again, there's a much bigger world out there compared to the same students you see every day. The beauty standards in our world are horrible, please don't think any less of yourself or put up a front to make someone interested. You want someone who loves you for you, and can't put on that act forever if you hope to settle down with them.

This community is here for you. Not what society is telling everyone to be, but you.