That said, you're pretty young, and your awful diet has evidently not caught up with you yet. When it does, I predict a swift re-evaluation of your ideas about nutrition and self-exceptionalism.
Right now you're doing OK because you've got a relatively high metabolic rate. By the time you hit your mid-30s to early 40s, a natural drop in testosterone is going to slow that metabolic rate right down and you'll see a gradual buildup of belly fat. In fact, I can already see the beginnings of it in your photo right now. I can't see your jawline but your cheeks look a little full for a guy your age.
I used to be 140-150# and now I fight to stay at 180#. In all likelihood I'm never going to get back to where I once was. I've redirected my goals to minimizing bodyfat and building muscle. It's not easy but my health has improved markedly.