> my penis feels like senceless...
This sentence hit the alarm for me: are you by chance circumcised?
I am more inclined to believe that this is a temporary situation, more or less like NaluKana suggests, since you are so young. But circumcision is an important factor.
Otherwise you should abandon porn. You don't need it at this age. You don't generally need it at any age. Stay away from it, it drains your potential, physical and psychological. Let your brain and body do their work as nature, and not as the porn **industry**, means to.
Erection problems can be caused by anxiety. I would try not getting an erection for a couple of days as kind of like a healing period. If after like a week of not trying you are not able to, i would see a dr. as they will be able to help more than anyone online can. More than likely though you will find that it is better and just a temporary problem.
Best wishes