Hi Kitt! And welcome!
Clock's right - chances are slim of seeing your work on the big screen. Simple mathematics - too much material being produced, too few venues. Too much money to make a film today. Too many wooden-headed decision makers in Hollywood - they want safe stuff only. And as we writers know, writing is an art. Safe don't make it. But they've got quarterly profit reports and bean counters to please and action dolls to promote and sell. So: We get remakes, sequels and comic-book flicks. Pukingly disgusting.
Having said all that, fortunately I am a hard-headed stubborn anti-authority type who is going ahead with this venture anyway. I'll flood 'em with scripts, and kick a few butts if I have to. In other words, I'm just enough of a damn fool to think they'll eventually make one of my "gems".
So: HAVE AT IT! Write from passion. Write because you HAVE TO write, because it's THE way of expressing what you need to tell the world. And who knows?
No matter what - writing will make you a more interesting person. Pretty good deal, that.