I'm 21 and my jaw hurts because I haven't gotten my wisdom teeth out yet and my teeth are crowded.

So every once in a while I pop my jaw, I open it and flex it. Sometimes it makes a loud sticking noise and I can feel it pop.

What's causing that (besides my flexing my jaw!) and is this bad to do to relieve some pressure until I get the wisdom teeth out and the braces to space my teeth out?