Going back to work

I honestly don't know if I can do this. My little one is 2 months old and I go back to work in a week. I've been so emotional lately. I feel like I'm a horrible parent to leave him. I feel like he isn't going to even remember who I am. I enjoy my job as a teacher and need to work to help financially, but I just feel so horrible! How did you  all get through with going back to work?! I need some reassurance. :/