From another who also needs to be liked, I think it is a vicious circle. I don't much like myself, so I depend on others to like me as evidence that there is something to like, but I can't believe that anyone actually does like me because I can't see anything worth liking, so others can't see anything worth liking either so how is anyone going to like me? And even if they do, I'll just throw it back in their face, so why should they even bother?

How can you get beyond it? Learn to like yourself. And also, be genuine. Stop pretending to be someone you think you need to be to get someone to like you. If you're not being yourself, you're not going to like yourself because that incongruence doesn't feel very good. You have to be honest with yourself in order to like yourself.