I am feeling sad that I might spend my 18th birthday alone

I turn 18 this coming Saturday (12/14) and this is something I have been looking forward to for years. I am trans and have a rough relationship with my parents, so becoming a legal adult means so much to me in terms of starting to live life the way I want to. I have been putting off planning a party for so long because I don't really have any close in-person friends. Now that it's in less than a week, I am starting to realize just how sad it is that I probably won't have a party, or at least one that I can enjoy (of course there are my parents, but due to trauma I can't even really function normally around them). Every year until this one, I have had at least a few people to come over and celebrate, but they have since moved away or we have grown apart. It is upsetting that this year, the big year, I have no one. I am trying so hard not to compare my birthday to other people's birthdays, but it is hard when everyone I know has at least a small group of people they can get together with. I feel disappointed and lonely. If anyone has advice on how to cope or what I could do to celebrate I would really appreciate it.