One of the best things about being a screenwriter, is you get to make stuff up. Whether you're a paid professional, an amateur trying to break in or even someone who does it as a hobby to pass the time. Not entirely sure why you'd want to do it as a hobby to pass the time. It's hard work. Perhaps you have an overactive imagination and you feel compelled to write. But each to their own. You get to make stuff up. You get to delve into your imagination and create worlds, situations, dialogue that could only be possible in the movies.
Well, that's not strictly true. You could write novels and short stories as well.
But we're talking about creating a story within a certain amount of time. A certain amount of pages to convey your story, your character's wants and needs. But that's what makes it such a challenge. As screenwriters, or any writer for that matter, we have the opportunity to use these stories that form in our imaginations and gestate in our subconscious over days, weeks, months and even years. As screenwriters we can pluck out what's in our heads and put these ideas down on paper and hopefully create an interesting, exciting and cohesive story over a period of time. With memorable dialogue, situations and characters, not to mention, eye popping locations.
But it takes time, hard work, dedication to learn the craft and a willingness not to give up. In it for the long haul. As long as you have an imagination, creativity and the want and need to write. Do it. The only person that can stop you, is you.
So get cracking and get writing.
Not sure if any of that makes the slightest bit of sense.
Write, write and keep on writing.