can you set up a little PVC in your yard or something? you just need a session alone where you can convince yourself to jump onto that rail and see it isn't so bad. if you fall you won't be injured
just start really really small, then once you have a few of the fundamentals going, you can post a video on here for people to give you feedback on (super useful), and/or next time you're with people you can let the peer pressure/hype convince you to put your basics to the test
remember, flex your core, LEAN FORWARD. there, i just saved you 5 falls at the beginning