Is it normal to be anxious about this

I’m (28) moving in with my bf (29) of five years in a month. My bf says he’s not stressed out at all and is excited. I literally avoid thinking about it due to feeling anxiety whenever I do. I just do everything I can to distract my mind from it otherwise I’ll get overwhelmingly sad. I’ve never lived anywhere other than my childhood home. I’m 28 now. I tried dorming in college and couldn’t do it. My bf dormed so he’s used to it somewhat. So I always think back to that failure in my life. I failed to live outside my home the first time around so I have a fear it’ll happen again or my bf and I’s great relationship will tarnish and we will break up. Can someone please ease my mind bc I am so nervous :(