Fear of cars and the road

Hi everyone, I just wanted to post this and see if anyone has advice or deals with the same thing. I want so badly to get into biking, but I sustained a TBI a few years back, and now I have a much lower risk tolerance. So when I see bikers in the bike lane, I always fear that a car will hit them, thus the reason I haven't bought a bike.

I use to enjoy trail biking a bit, but also can't really afford to take another spill and rattle the brain.

Anyone deal with something similar before?

UPDATE: TBI means Traumatic Brain Injury, I am going to look into Gravel Bikes and apps like Zwift.