Just found out my bf was a virgin before me

I've been dating my bf for over a year and before that we were close friends for a few years. We have INCREDIBLE sex and I always wondered how many people he had slept with before me, assuming it was quite a few to perfect the craft haha. Well we finally discussed it and it turns out he's only slept with me. I am so taken aback. Very impressed, obviously but I guess I'm also a little concerned because now I know he doesn't have anyone to compare me to.

Has this happened to anyone else? Is it normal to feel this way, how should I have reacted?