I think this happens to anyone that is actually decent or good at dev. You work hard, learn on your own, spend countless hours in front of a computer, churn out a bunch of websites, and finally somebody notices your talent and hires you. I've been mostly working for the same guy for about 5 years now, and technically still a freelancer since I'm working from home. What would make me anxious or nervous to have a "real job" would be the other people, not me. I'm just not great at communicating with people.
So I don't really have any advice for you, but congratulations. Remember, since you're not working from home anymore, you actually do have to get dressed.
