Not good enough to be someone’s first choice??

Why am I always the second choice, sometimes not even second.

Why do I get used by people until they get someone better?

I always feel inadequate and not as good as someone else.

What is wrong with me? I’m not that ugly (at least with makeup) and I have an alright body, and my personality isn’t trash I don’t think.

What can I do to be liked enough for someone to see potential in me??