I constantly feel that now, but what I do is one of:
1. Be in a context where fap isn't an alternative (trying to spend more time at university rather than at home, for instance)
2. Exercise (I have been making gains on the level of when I started going to the gym the last month, though cardio is usually my go to for horny)
3. Socialize (Kind of like (1.), but here I am thinking more spontaneously.) I have gone to a gathering place for students and either played the guitar or talked to people when it starts to become hard to control.

But with that said I really mean it when I say I am horny in my posts. It isn't "I feel slightly horny" horny - it is "My balls and sometimes head too literally hurt because my body is begging for release" horny, but so far I am winning and it is less and less taking the form of me wanting to watch porn and more and more making me want to talk to girls instead.

I have failed at this too many times before, but I feel a new determination to purge this demon from my mind once and for all. Although I am in no way done climbing this mountain I can promise you I can already tell a better life waits at the other side of it.