When I was 15 I was in a relationship with someone who was 24. I can state unequivocally that this is not something that has affected me. In fact we are still friends- to the extent that exes can be friends.

Perhaps the fact that 16 is the legal age here or that it was another woman or the relatively small age gap factors into the mindset but I do not feel any sort of trauma from it.

Having said that though. The fact that you are confused would imply that maybe there is something underlying there.

I would suggest that you talk to your therapist. They can probably help you understand a lot better.