Recurring Self-Doubt

I’m choosing to focus on a negative thoughts with relation to a crush. “I am not attractive enough for him, he is too old for me, I am not what he wants.”
I thought I had grown out of thoughts like that. I feel ashamed that I am struggling with these thoughts.
What follows that thought is

F self loathing
A Behave shyly and be embarrassed around him, or avoid interacting all together
R No connection

I’ve considered new thoughts like:
I am attractive enough as I am
We are all human
I can be happy whether he likes me or not

What’s an alternative, believable thought for me to try?