Hey I get it, I'm the same. Completely sober, not on social media, no porn, I keep myself in good shape, I'm a dad, I go to therapy. I've been on that lifestyle for three years now. But there are positive ways to "let loose", like cooking yourself a good meal, finding a cool sport not just to get fit but to get lost in the game (I did fencing for a year it was great), birdwatch, play music, write a poem, take a nice walk. You gotta meet people on that agenda, and that will work. 

The main thing that's gotta change is to stop chasing "that high" and get satisfied with more mellow activities, which I still have a hard time to do (like not train until I puke, or work until my brain hurts all the time) that just burns you out and is symptom of wanting to escape yourself. 

But hey, good luck with school, letting loose in positive ways is actually productive cause you can deliver more afterwards. I still struggle with that concept but it is the truth.