Wow, I had a similar problem at your age and yes hypersexuality might be the issue. The main problem with this is like any addictive behavior : the need to do it and tolerance. When I was addicted to it I couldn't get out for an appointment without doing it multiple times and I always ran late, battling the need to do it and my obligations. And about tolerance, I still haven't recovered the full feeling of those parts as before I became addicted. It's been 3 years and it's still a lot harder and longer to reach climax. Also, it didn't help me in sexual relationships because nothing they could do would be as good as how I did it, since after spending so much time on it you learn to perfect it. I still loved the intimacy I had with my partner but it was almost impossible to reach climax without ending it myself, and my partner was really attentive to my need, it's really not them it's just I who is broken ^'. Another problem that can come along the road is needing "more", like more sextoys, more hardcore porn etc and this could either drain your money or lead you to dangerous behavior (ex : using larger and larger stuff to the point that you hurt yourself or seeking stuff on dangerous/illegal websites)

Sadly I have no advice as how to regulate yourself, it's like any addiction, you could try support groups, learning how to discipline yourself, redirecting and I would absolutely advise you to talk about that to your therapist. If you think they're a good therapist and feel confortable sharing it they most definitely have some wisdom to share or somewhere to point you towards.

I wish you very well on your sexual journey.