Confidence and self-esteem

I don’t have any of either. My boyfriend tells me how wonderful and beautiful he thinks every part of me is all the time, and I guess technically I’m not overweight or anything (not that there’s anything wrong with that I’m just clarifying). I just always get down on myself about how I look or how my body is and it makes my anxiety convince me that he’s going to get tired of me and leave me. I know that sounds crazy because he thinks I’m great but I just don’t see it about myself I guess. I know confidence is attractive but I don’t have any and it makes me feel sad all the time. I just don’t know what to do to make it stop so I can love me as much as he does. I know it’s not fun to be with someone who’s constantly criticizing themself 😔