POCD worry and feeling like I've done wrong 21+

When I was 19 I made the decision to try and help someone that was struggling with OCD. I don't know why I didn't say no because this person was a minor and I was dealing with POCD at the time. They were 17 and I was 19 but even while having OCD I feel like I tried my best to help in any way I can. I did not try to be this person's friend at all and I know I 1000% did not try anything with them inappropriately because that would be disgusting. The thing is, they were struggling with POCD, which is very ironic because I had this and it's targeting the very thing I never want to be apart of, is being friends with minors. But as I said, I was not this person's friend. I eventually got uncomfortable to the point where I no longer wanted to talk to this person because the age gap things was bothering me so much, even though they told me that were like a month away from being 18. I tried to not give them reassurance, I even sent them things that can help dealing with reassurance and what not. Time and time again I think about this and I feel horrible about it. I don't think about it all the time but it does time up. Maybe that's a sign it's OCD? But what if someone doesn't understand? I know I'm not a pedo or a groomer but just the fact that I have messages someone that wasn't an adult, even though I didn't want to, is what bothers me so much. This all began because I was triggered by an event of a similar situation (Although the situation was a lot worse in comparison) it made me spiral pretty badly. I don't know if I can ever move past this completely. I didn't even want to speak to this person but something told me to help them to I guess be a good person? To be a good Samaritan? I don't know. Is this really bad?