Zoe, welcome to PC. You can be whoever you want here. It is a great place to explore and be yourself. I joined a while back and never posted so I did not see how much there was, but the more active I am the more that I see there are understanding people here that are interested.
Part of the problem we face when we confront challenges in our lives is that we are forced to change. People around us want us to be the same as we always have been but that is difficult. Not sleeping is a big problem. Hope you find a way to relax. For me a shower, soft instrumental music and a non-exciting book are my preparation for sleep.
SIngle sites can be very impersonal. People are not always interested in who you are but what kind of fun they can have.
Maybe you are still finding out who you are. I bet that there are creative activities like crafts, painting or music that are waiting for an opportunity to come out. You might like some of the forums.
http://forums.psychcentral.com
there are quite a few.
You also might like the CHAT - see at top under BLOG and NEWS there is a link.