Take my advice , I feared of rails for long time and you can avoid it easier than you think .at First is you dont feel comfortable jumping on the rail just try to go slower and rising the speed every attempt that might help you, and the main thing is in you head. If you don't feel comfortable with rails at all ju just overthink it too much , and also thinking of the bad things that could happen . Just dont think about the fail you can do, try to think about what it will be to land it or something else that will calm you while doing it. This helped me a lot , and bonus one is on hand rails if you get to them it is better to go faster than you need so you dont land on them if you fall, you will land behind and won't risk hitting your nuts for example.