What if someone hits my car while parked and i don't have car insurance?

Several things can happen.

Allowing you parked legally other than insurance: the person who hit your parked car is responsible to pay damage.

If you were parked on private property the lack of insurance means nothing.

If you were parked on a public road or public parking lot you could be on the hook for a ticket for uninsured vehicle, but the other guy should pay anyway.

Don't admit to driving with out insurance!