scared of sex

Me and my boyfriend have been dating for almost 4 months but I've known him for over 5 months. Sexually we have done everything but had sex. We are going on a weekend trip and staying in a hotel for 2 nights. We will probably end up doing it over that weekend. I'm just beyond nervous & anxious. My biggest fears are It won't fit and It's gonna hurt very bad. I haven't had anything that large in my vagina. Don't get me wrong I really want to have sex with him I'm just extremely nervous. I've read articles that you have to relax and I mentally cannot because I have a anxiety disorder. Also how do I bring up that I'm nervous about sex with him? Thanks everyone 🙃💘💕😉💕