"It's not what you are that is holding you back.

It's what you think you are not."

Love yourself, be confident. 

If you think u can relate to this topic or you want to know these relation between low self esteem and social anxiety, then you can go through this article. It's well conceptualized. You can check it once. 

https://buddingpsychologists.org/how-does-self-esteem-influence-by-social-anxiety/