You don’t have to love yourself to be worthy of love.
You don’t have to love yourself to be capable of loving others.
You don’t have to think you’re beautiful to be worthy of respect.
You don’t have to have perfect self esteem to do worthwhile things.
If you don’t feel good about yourself, it’s worth working on that. (Including, sometimes, by changing some things you feel bad about). But don’t make self esteem or body positivity into yet another stick to beat yourself with.
You matter, no matter how bad you feel about yourself.