The fact that exploitation of sex exists is not under discussion. Exploitation of everything exists.
Addiction/preoccupation is, and the desire of the OP'er to keep a tight control of it is.
Like anything else, if you find you're doing something to the exclusion of other things which require your attention, there's a problem. The problem is that YOU (and others, but we're not discussing them) cannot do what you're supposed to be doing. If it weren't porn, it'd be something else. YOU need to examine the problem which is not doing what you should be doing.
That will involve a therapist since it involves stuff you can't get to by yourself.
As for porn...well, I'd go with what's already been said by starkers, WG, Shelby, v, fuzzy, Karen and others. That's me. You'll develop your own ideas about it. NightTrain said some very insightful things in this thread. I encourage you to find them and to save and think about them. One of them is that you can't bubble wrap the world. You have to develop mechanisms to cope successfully with things and to render them nontoxic to you by understanding them and yourself. Try to remember what one of the most insightful people in (recorded) history wrote: "The fault, dear Brutus, is not in the stars but in ourselves."
In your case you found sex to be a powerful stimulant. Congrats...join the human race. Should we limit what minors see? Yes. A better method is to have them observe normal relationships and teach through example. And do it gently, with loving kindness. Without guilt and shame.
The human race has had enough of that crap. Time to evolve and move on.