sad about losing my virginity

I'm 18 years old and I lost my Virginty 3 days ago and I was happy and ok with it until today. I am a Christian and I feel dirty for having sex in high school. I cried yesterday because there was just a lot of emotions and I'm not sure how to feel. I talked to my boyfriend about it and he's well aware how I feel and he said he'll do anything I want. As a Christian I should probably stop having sex but I just feel like I already lost it so why stop now? I'm just really upset and confused, any advice would help!