Scared of not knowing what to do!

Being that I'm at first time mom and I'm only 23 there are so many things that scare me. First I'm moving out with my boyfriend, I've always lived at home with my mom and dad and thinking about leaving them is freaking me out. Second I feel like I won't know how to handle being a mom and taking care of the house. I feel like I'm growing up way too fast and it's going to hit me emotionally which I don't want because I need to focus on my baby. I'm just really scared that I won't know what I'm doing!!