I am 23 years old, my left "bigger toe" is tingly and numb. what could be the cause?

Neuritis: Its not unusual for a small nerve which passes over a bump at the base of the great toe to become irritated by a shoe (usually when there is a bunion present). This can cause numbness and sometimes pain along the nerve. If you are talking about the great toe and you have a bunion (even a mild one), this could be the cause.

A few things: Could be compressed nerve in foot or higher up even in back, can be sign of systemic disease like diabetes. Can be a condition called smallnerve fiber disease. A visit to a foot doctor to help differentiate these entities is recommended.