Self esteem?

Does this happen to anyone else or just me?? I used to be super skinny, 94lbs. I got married and started using birth control so I gained weight. We decided to try for a baby and I got pregnant. I gained a lot of weight (I was 150). After having my baby I went back to 120. I am comfortable with this weight. I look at myself in the mirror and I don’t feel fat or skinny I feel perfect! I love how I look, but when people take pictures of me, I look fat, it makes me really insecure and makes me think, do I really look like that!? How do I feel comfortable when I see myself but not when others take pictures of me!?