Body issues

I feel so embarrassed to admit this but sometimes I get depressed on how i look. I know my body has changed since I had my son...every time I get out of the shower and I see my body in the mirror I just break out in tears. I know my boyfriend says I'm always beautiful but I just do not feel it. I am beyond happy with my son but I get those moments that I wish I lost weight and had more energy and felt more beautiful. I know I am not alone in this... I know other mommies can relate. I just need advice to deal with this sadness.