I won't let him love me.

I am a very self conscious 15 year old girl who is just simply not happy with herself. Recently a boy has expressed that he is attracted to me and wants to know more about me. I instinctly don't want myself anywhere near this situation due to my confidence and self esteem, I feel that I am too big to be with him, and I wouldn't want that for him. How can I let somebody love me when I can't even love myself? I would greatly appreciate some feedback on how to deal with this situation. Thank you for reading ❤️