What are some songs about feeling insecure?

I've been talking to this guy for about two months and when I'm with
him I feel so insecure about my appearance because I know his past
relationships have been with smaller and what I think to be prettier
girls. This insecurity is causing me to question whether I should end
it and tell him I just want to be friends..
Another thing that bothers me, is that he met me and one of my friends
(who has the body type he likes) at the same time and I feel like he
tried getting to know her first but when she didn't have a personality
he liked, he moved on to me and I hate feeling like his second
choice..

I mainly want a list of some songs that go with my insecure feelings.
But songs to make me feel better and worthy would help as well.
Thanks!