my internet friend

So I've got this internet friend Let's just call her Mia. Mia and I have been friends for like 4 months. We actually started talking cause we had an mutual enemy lol and we both were pissed at them. But from that we became quick friends. We talked literally everyday. For hours on end. Mia also had another friends but for some reason during that time her otehr friend wasn't active. But when she was online again Mia created a groupchat where me and the other friend were there. So Mia and that other girl started talking and they talk a lot. More than I talk to Mia. And she seems a bit more cold toward be than she used to be when we talked on private message. Although she's always a bit more friendly in pm idk why. But these aren't the problem. The problem is I'm more connected to her than she is to me. I never had a friend like her in my whole life irl and internet. We are basically the same. She even called me her twin (she still does) but the thing is I'm so connected to her. I'm afraid she just sees me as a normal peer she talks to sometimes and nothing more. or she'll think im weird for being over attached in a short time. Ahhhhhh I'm going mad and the fact that I have depression is making it worse. And I also had bad experiences with having "friends" I guess I'll just have ask Mia if she started not like me as much. But I'm also losing hope cause if she says no then it'll be my fault for trying to be her bestfriend. Got any help? :^)