I hear ya, and totally understand. I feel like that a lot of the time too. I just got out of treatment for an eating disorder. I made lots of friends, but feel unimportant when I see them getting together on fb and not inviting me. When they say they can't do something when I ask if we can get together, which becomes a regular thing. Then I see them on fb or instagram doing things with each other. It sucks to feel like no one cares. I also have to keep in mind that I do have at least one person who cares about me and loves me. It's just really easy to forget when I'm feeling upset and discluded. I also have BPD and that makes it so much harder to know if my feelings and thoughts are a reality. To me, I find proof based off of the perceived avoidance from others, but apparently that is not considered proof. It's always best to fact check that with the people that you feel dont care ( if they are safe people). I am sorry you are feeling so alone. Just know that you are not alone in that.