To add on to my previous post, the old adage is that it will take 10 years or 10 scripts to get a sale. Which means, theoretically, you have 8 scripts which will be terrible. Now, hopefully one of those terrible scripts will be in your genre, but if not, it still gives you 2 scripts to get the sale.
My timetable is roughly as follows:
1-3 scripts - shite. Don't show them to people unless you are really secure with yourself.
4-6 scripts - average. Now, you've taken the good things you do and integrated structure into it.
7-8 scripts - good. You're coming into your own as a writer. You have a genre and a voice, and you know what you want to do.
9-10 scripts - sellable. Hopefully, you've mastered the little things, like action cues and formatting that kept your script from being sold before.
Congratulations, now you're a writer. get ready for a life of rejection and under-appreciation.
So, you see. there's plenty of time to write a whole lot of junk, to see if you like writing for that genre, and abandon it when you decide you don't like it, if you decide you don't like it. Remember, it's a marathon, not a sprint.