My bite, for some reason, has become misaligned. each time i bite now my upper and lower teeth to not close together properly and is causing me pain.

Misalignment: It is very important that your teeth meet properly. Please see a local dentist for an evaluation and treatment options.

Many causes: Teeth can become malaligned from numerous factors. The more common reasons include aberrant jaw growth, loss of 1 or more teeth, slipped contacts, uneven wear, and many more. See a tooth alignment specialist, an Orthodontist, for an initial (probably free) examination.