Am I depressed or just overwhelmed?

Ok, Im 23 married a year in February and have a 4 month old baby and own a house. I really feel like a reject because all my friends are out having fun and living the party life with no responsibilities or a care in the world. I was never very "popular" meaning I never really went out and partied or had fun with "the girls".. I was always more mature then my friends and that stuff just never really appealed to me.. Well now I feel like a beat up old bag of poo.. I have always had low self esteem but now its lower then ever. I still havent lost any baby weight and I feel really gross. Most women seem to love their babies right away while I still dont feel like Ive really connected with her.We got a camcorder to video tape our baby growing up and the other day I saw myself on a video.. I was literally the size of a whale I cried quietly to myself in the shower later that day seeing how awful I looked. My husband, though very sweet and funny, is very lazy. His only house chore is to take out the trash and sometimes put the dishes away.. he says he will do more if I ask him but when I ask him to help me do something he always says " Ill do it later" and later never comes.. or its something I need done right away and in the end I always end up doing it anyway just so that it can be done.. We both work from home and he watches our baby during the day and I take over for the most part at night. She sleeps alot during the day, however, so really I do everything and my hubby does very little, he watches her and has to feed her but shes only awake a few hours during his work time... When I get off I have to clean, cook dinner, watch the baby and feed her, do laundry, fold laundry, and any other house chore..my only time to myself if the grocery store..all the while he plays xbox and watches TV. I dont know if Im depressed or just overwhelmed... but I feel really down all the time. I cant remember the last time I was really happy rather then just feigning happiness to cover my hatred of my life. I love my husband, I love my baby but I just feel awful about myself.. I feel terrible about the way I feel about myself and my situation because its not like it was forced on me.. it was my choice.. but I really dont know if I should speak to my Dr about the way I feel.. or if its just me being a drama queen.. Im feeling fat, under appreciated and just plain sad all the time..