You should understand something critical about most child porn offenses. The fact that you are under 18 does not give you a defense to the crimes; it simply may mean that you get prosecuted under the juvenile court system rather than as an adult for those offenses. Thus, I tell teens that trading naked and sexually suggestive photos of themselves and their friends/lovers is a bad idea. While you are not likely to get caught for doing that unless someone complains to law enforcement about it, all it takes is one ticked off person who knows you did it to turn you in and you have a problem. Law enforcement otherwise tends to focus on the more severe problem of the commercial child porn peddlers that are out there. You won’t know if law enforcement is going to come after you until it happens, and it may never happen. So don’t panic yourself here. There is nothing you can do now about what you did in the past anyway. But now that you are an adult, act like a responsible one and not involve yourself in pursuing sexual related things with minors going forward. And yes, it was a good idea to delete the material you had collected.