I have this too. I hate being in the car and needing to go. For a couple of reasons really. When I was younger I got lost trying to find the toilets and I keep having constant dreams with them in, about getting lost etc. They are driving me crazy lol.
Im also afraid to go into like a diner thing unless someone is with me. I hate the thought of all those people in there watching me as Im trying to find the toilets.
Some have locks that are hard to use and I have a fear of getting stuck in them. I have done before! Or the ones where there is a long queue you have to wait in and then you end up in a cubicle where the door wont shut. So I try to avoid to go when there are queues.
Also those ones where you have to pay to use them put me off so I avoid them. I think that I wont know how to use those machines as Im not very good with technology and stuff so most things I find complicated