What do you advise if i was wandering if an underbite can grow because i think mine is?

Advice: My advice is that you seek the expertise of a local dentist who can examine you. If you are missing many posterior teeth, your bite may have collapsed, forcing you to chew on your front teeth and sliding your lower jaw forward. I doubt at that 33 yrs old your jaw is still growing.

Not at 35: Unless you have Marfan's Syndrome your jaw stopped growing many years ago. Improperly positioned teeth, however, can shift adversely, making the problem more severe. You're many years overdue for an Orthodontic Consultation. Please see a Specialist.

Unlikely at 35: I would suggest that you have an orthodontic consult.