Working moms, how do you get rid of the guilt about not staying home with your children?

I am a mother of a 2 year old boy and have worked from the time I came back from maternity leave to a few months ago when I quit my job of 4 years. I hated my job and either needed to switch or stay at home. Living on one income is different but I am in a position I can choose whether to return to work or to continue to stay at home.

I feel like I hate staying at home and the guilt of saying that is eating away at me. What kind of mother chooses to work when she has the option to stay at home with her child? I just don't know what to do. Every time I think about going back to work I look at my child's face and think about him needing me and how selfish I am being for wishing I was working instead of being grateful to have the opportunity to raise him and be with him 24/7.

I miss the opportunity of growth I had in my own life with a career. I miss being competitive, and I miss being somebody. I feel like I am nothing here. You won't get promoted sitting at home all day. I also feel like I'm not good enough as a mom. I worry that he doesn't have any other children to interact with and learn, or that I don't teach him the correct things he needs to learn, or I don't play the right games, or I don't feed him the healthiest foods. I am just so out of my element at home.

I am just stuck. I feel sick to my stomach thinking about everything. Please... Any advice, I will gladly take.