Fetishes are irrelevant for porn addicts, as you don't really know what constitutes your natural sexuality, and what has been caused by escalating desire for dopamine spikes.
Make sure you read the main articles on
www.yourbrainonporn.com to equip yourself with knowledge on what is actually happening in your brain. Knowing what's going on can make your struggle a lot easier. I'd recommend everyone be porn free, there's just no need for it.
On to your main question: "Has my libido been used a lot"
What you have to understand is that the brain isn't like a stone that you carve into, it's more like a piece of plastic that you mould and remould. All of the changes that porn cause occur in the brain, not in the pants. By rebooting, you're rewiring the brain to natural sexuality, giving it a break from being bombarded by supernatural stimuli. This way, given enough time, your brain will return to normal. Being so young, and finding out about the potential negative consequences of porn use relatively early, you should be in a good position.
My advice: forget about what you've done and seen, quit porn, find yourself a real partner to connect with.
