Thank you everyone for your replies.

I met these girls separately (probably average around 10-12 years ago - one girl it's been about 17 years) and to be honest we all got together through me. I used to be close with them individually but then we all got to become a group over time. That's why I know things shifted the way they did naturally. Perhaps I feel this way more so because each of them were close to me first and then as we became a group it shifted and now I'm not as important.

I have actually bumped up my effort to talk with them more often the past month and be interested in their lives. They do respond back etc. but I'll never be what they are to each other and they don't contact me as much as they do with each other no matter how much I try without looking desperate/psycho. I did pretty much tell them my concerns about our friendships drifting but they did not see it that way. I don't think they're intuitive as I am about things. I think they see that since we do "see" each other often and we do things often as a group, that there's nothing wrong. And there is nothing wrong with them becoming closer with each other so I don't want to make them feel like they're doing something wrong. I can't force them to be to me how they are to each other.

One girl told me she's close to us in different ways, but how is that possible when she never makes an effort to really speak to me first or ask me about my life but makes a conscientious effort with the other girls? I know it's not done intentionally but bottom line is I'm just not their number 1 go to person as they are with each other. I WISH that I could be, but realistically I know I won't and I think I'll be okay with that, I just need help getting to that point where it doesn't bother me. I just want to be okay about things and not feel disappointed when for example I see they're facebooking each other to call, to give words of affection, etc. but they never do that on my facebook page (although I'm constantly reaching out first to them all the time). There are just bonds created that I can't penetrate and I feel like my role now has been that they still love me as a friend but I'm being treated like an acquaintance. They still call me out to do things (and I'm not being used because I don't have a car or lots of money etc.). I know they call me out because they want to be around me. I just wish we were all equal in eachother's eyes how they are to me.

I'm just really sad and left out and I know a lot of people have it so much worse than I do...but I think I'm just mentally weak and can't get over it and it's bringing me down.