I can’t ask for advice to family, I need advise from someone outside my circle.

So I have a friend who I’ve known since high school,now we are in our mid 20’s. We’ve been hanging out whenever our schedules allow us. He is a guy who is more sexually active than I am. I wasn’t sexually active until recently (basically I lost my v-card to him). The times that we do hang out with each other we just flirt, we never get too far with each other bc I’m not used to being touch. Now that I’ve lost my v-Card to him i feel like i have made a big mistake or that this is the biggest sin I have committed. I like him and he likes me, i am scared of commitment , but my problem is why I feel like this? I know it’s something natural but I’m very unsure of the situation. Or where I stand with it being my first time? FYI I do have anxiety so that could be it.