I would like to fix my teeth and jaw. What should I ask my dentist? (Photo)

I am 19 years old, male. I just realized that my jaw is misaligned (lower jaw i think). My jaw has been locking for about a 2 years now and it really hurts when it locks. Nowadays I have been experiencing mild pain when i open my mouth big. I would like to have a better understanding of whats wrong with me and what I should do/tell my dentist. I would like a wider smile too.