What helps me? My pride. I tell myself I'd rather eat fucking shit than look like a pussy. I'd rather hurt myself, than go home disappointed that I didn't give myself that chance to do something. Its about will power, either you have it or you don't. Which person are you going to be?
What also helps is learning how to fall. I've ridden Longboards down steep streets going 25+ mph and fallin, BMX, dirt bikes, martial arts of varieties, and team sports for 15+ years including foot ball, and I've never broken a bone. I know how to fall and transfer my weight. Knowing how to do this will greatly boost your confidence to try things that will make you fall, as you know how to get out of it. Having that security in the back of your mind will help you break mental blocks. Find your mental security.