I 22F have never kissed anyone before. How can I bring this up with the guy, 20M, that I am seeing?

Okay, so I 22/F have been talking to this guy 20/M for a little while and we've gone on a few dates and I think it's going well! A mutual friend introduced us and we've been talking and going out for a few months. I really like him, but until I got to college I had never been asked out and all of the guys who had shown interest had been kind of creepy. I don't know why no one asked me out in high school, but it has left me with a deep self-consciousness in regards to romance and intimacy. I'm still a virgin and have never kissed anyone and I'm embarrassed about it, but I'm still not sure if I'm ready for anything sexual. I could tell he wanted to kiss me tonight, but I told him I had homework and we both left (on good terms). I've had friends who have been dumped because their partners could tell they were inexperienced. How can I bring this up without feeling embarassed? How do you prepare to kiss someone and make it seem like you've done it before?