At least for me, my biggest fear is the fear of getting hurt (or more specifically pain). This definitely isn't the smartest way to work past it, but for me I have found two things that work.
A) Send it before you can think. If you roll into a cliff/jump/etc and just say "I'm going to do this" and then shut your head off before the frontal lobe can yell "HEY WAIT THAT MIGHT NOT WORK ENTIRELY RIGHT AND YOU COULD GET INJURED". Potential flaws include: incorrect speed, poorly aimed takeoff, and other risks from going completely blind into what you're about to do.
B) Get irrationally pissed at something/anything, to the point of seeing read. Goal is to get the "fuck everything" mentality to where you're actually skiing super hard and looking to get hurt, because of how rad you're getting. Difficult to find this mental zone, but a low blood sugar can expedite it. Potential risks: damage to personal relationships, and, uh, probably just isn't a good idea. If you are Dr. Jekyll and can switch between the two almost at will, that's perfect.