What do you suggest if i've been wandering if an underbite can grow because i think mine is?

Ortho Exam: Unusual to occur at your age. See a qualified orthodontic specialist asap. Ask your dentist for the best adult orthodontist in your area. Orthodontist's are growth and development experts and can determine if your lower jaw is outgrowing your upper jaw. If so, treatment choices can be discussed. Go nnow so orthodontist can establish a baseline.

See an orthodontist: yes, if left untreated, the condition can get more severe. I would suggest seeing an orthodontist for a consultation.

Simple solution: Under bite can be quite aggressive. See an orthodontist for evaluation, imaging and treatment options.