Coming to terms w lost virginity

I'm 18 & my & my boyfriend had sex on 2/20 & it was my first time. I don't regret it but I'm still surprised that I even had sex in the first place. Im so used to the lifestyle of being a virgin & having that as something to keep my values straight. But now that I'm not a virgin, I feel off. If that makes sense. Like am I the only one that feels this way?