I have had an overbite since i was born (i guess) could that be contributing to my possible tmj?

Absolutely: The overbite disrupts the normal path of movement for your jaws. This will strain the muscles of the tmj.

Quite possibly: Malocclusion is the single most common finding in patients with joint dysfunction. Please see a qualified orthodontic specialist to evaluate if our occlusion is causative of or contributory to your problem.

Sometimes: Some studies show a relationship between your bite and TMJ. However, must patients with "overbites" do not have TMJ.