[Sexual Health] I feel really bad about losing my virginy

Throwaway so 18/M/Gay

I lost my virginity last week after meeting a guy in a nightclub and going home with him. The sex itself was fine and did not hurt and all precautions were taken so I'm not at all worried about that. However I'm finding myself repulsed by it, but I'm not really sure by what exactly. First off the guy was 30 years old, he didn't look quite 30 nor acted like it (although he did tell me), but I feel some regret that I had sex for the first time with a 30 year old man. I do see the funny side too though. I can't deny he was incredibly thoughtful, he didn't want to make me have sex and it was more my insistence that it was fine that finally prompted it.

Still now, despite being completely fine with it at the time, I feel really annoyed with myself for doing so. I feel like I let myself down because casual hookups I really not something which I myself aspire for. Even just making out on the dance floor with someone on a night out makes me feel iffy the next day.

I can't stop thinking about how much I regret it and don't know how to stop thinking about it, I wish I could just undo it.