Feeling Down..

I'm a teen mom and my baby boy is about to be a month old next week Friday and I've been constant crying and feeling really low and insecure about my body and just myself and I take everything so serious right now I can't take any jokes and I literally feel so down on myself I can't sleep at night I can barley eat.. I love my baby boy so much but sometimes I wished I never got pregnant.. should I talk to my doctor about this?