Im not very good at writing screenplays but want some kind of story to film.
I faced the same thing - I bet most of us here can relate.
I did two things that really helped. I shot a few one act plays
and I adapted a few short stories. Now I did this before the
internet age so there was no way I could show my films to anyone
outside of my small circle of friends and family. So I offer this
advice with a warning - you are technically violating the
copyright by doing those things.
That said, I found it really helped me. Not only as a director but
as a writer. It might be worth trying. Do NOT post the finished
project on the internet - just use the movies as good experience.
Even if you decide to give that a try, you really should write a
few scripts yourself and look around for writers who may not have
the means to make a movie.