i had a similar problem twice this week haha. first the rail at my house, the jump was SUPER SMALL compared to it, i manned up and hit it. first hit FAIL, don't get high enough, smash head off of rail. but then i think, okay, it can't get much worse than that. i made it on 2nd time but kept sliding off, took me about 10 tries but i got it, and could stomp it everytime. i was super pissed i couldn't hit my flat down rail though (lack of snow).
then the second time i was trying some pretzels on this little 20' rail at my mtn. i was first 270'ing off, to get the rust off. then 270 on fell a couple times gettin used to it again (first time at the hill). then just manned up and stomped it first try.
it's all about confidence my man. you just gotta know that you can and will do this rail. go up to it with a good amount of speed, straight at the rail, NOT to the side and pop up get full 90 degree spin land on the rail nicely look at the end of the rail, get to it and jump off. rail=stomped. next get some steeze into it, and that rail will be your bitch.