I Have No Friends and Need Some Friends

I have this one best friend but I feel like I care to much for her. And at times I feel like she doesn't really care for me the way I do her.. and every time she dates/gets into a relationship she just forgets about me and it's like I'm on the back burner and she's always trying to get me to hang with them /bring him everywhere like no this isn't a family occasion I asked you not him. So I told her if she continues I'll just fall back and let her do her .