What do I do if six months later, I am being sued for $1,800 by her insurance company for the damages because I wasn't insured, but I was on a bike?

I was riding my bike home from work one day. I don't have a car, so I do not have car insurance. My bike is my transportation. I was crossing the street at 3 lane intersection. The light changed before I'd made it across. In turn, I ended up hitting someone who was turning left with my bike. I hit a car, with my bike. I didn't get hurt at all, the damage to the car was quite minimal. A small dent below the passenger’s side door. A cop came and said because I did not have insurance I was responsible for the deductible to the car damages. I paid the driver of the car $500 for her deductible.