Replying to I keep falling off the same side on rails

So I've been skiing quite a bunch of my backyard rail setup recently, and I can't quite get the hang of grinding it.

I can do basic boxes and such, but I haven't done it or skied on snow whatsoever since last season.

Anyways, I spin counter-clockwise onto the rail (to the left), and I keep sliding off it early towards the right of it (where my back is facing).

Any tips on how to stop doing this and slide the entire rail, and hop off successfully?