lol you're a long way away from reaching your genetic max, as are most of us (with the exception of Totez, because he's massive). You want to look athletic, that involves having muscle, and that involves lifting. You're not going to get huge anytime soon. Listen to the guys like Jester and Totez because they know what they're talking about programming-wise, get under a bar and lift. You're guaranteed to like what you see in a year unless you throw a wrench in the plan. I was in your shoes self-doubting and doing wonky things in the gym for a long time and I lost a lot of time. I don't think you need bicep curls. Chins should be more than enough to build up your biceps at this point.