I need advice..... before I was pregnant i weighted 123 now after the baby I'm a 165 lbs ... I don't…

I need advice.....

before I was pregnant i weighted 123 now after the baby I'm a 165 lbs ... I don't feel confident in my skin. My boyfriend said he still loves me no matter what but I still feel insecure. I noticed after having the baby I been alot of fat food. what can I do to loose all this weight????