Nervous to have a second baby?

I am sooooo nervous about having this baby. I was only 17 when I had my son. Now I found out I'm pregnant again 7 years later. My family were not exactly excited but supportive. I am starting to get excited but I find myself being sooo nervous about it. I guess it's because I have anxiety and it doesn't help. I really wish I don't over think things and just let things flow.