One of my armpits is larger than the other and i keep getting a single long peach fuzz hair on my chin, neither cause pain, although my armpit is a bit embarrassing because of the difference in size. are they symptoms i should get checked out?

I would consider doing an ultrasound on the armpit as a simple way of seeing the structures. Several types of glands are in that location and in females occasionally breast tissue ends up there. Whether or not anything would need to be done or if it could be ignored will depend on what they find.

You should have that armpit examined just to make sure the enlargement is not due to lymphadenopathy (big lymph nodes) if you are not sure.