Well you have a few options here. One is working on being "important/good enough" for whoever's attention you're striving for and another is getting right the fuck over it because not everyone is going to like you for you and that's a fact of life you should be aware of. Another is your feelings may be invalid and stem from insecurity induced paranoia when you assume people who "supposedly care about" are lying. So maybe take a step back and stop worrying about how other people perceive you and try to focus on you and you alone to figure out why you're insecure and work on that before you get so obsessed with wondering what's wrong with you and why can't everyone love you why aren't you good enough that you lose more people being a miserable fuck.

I figure everyone is aware of this but I figured I would give you some friendly advice anyway.