I think that at your age it's likely to be from hormonal changes. Honestly, you shouldn't be worried about not having sex now or in the near future, as you're likely to have more problems that are bigger than pimples.
I think it would help if you started taking an Omega 3 supplement, along with eating foods that put a good amount of Omega 3s in your diet. Also a B-50 vitamin supplement would be a good idea.
Topically, you can put some extra virgin unrefined coconut oil on the area in the evening, you'll have to let it soak in as it will be oily. Cover up so it doesn't stain your sheets, etc. BTW, hello and welcome to the forum!
https://www.natmedtalk.com/wiki/Omega_3
https://www.natmedtalk.com/wiki/Coconut