Becoming a professional screenwriter is an incredibly difficult goal that takes a very, very long time to achieve.
This doesn’t mean it’s impossible. Just know what you’re getting yourself into.
Apart from writing, what are you doing to help yourself get there? There’s only one person who can be the most effective in helping you move forward. And you already know who it is.
Are you networking? Trying to meet other writers? Offering to give notes or swap scripts?
Are you entering contests to see how your script holds up under scrutiny?
Are you sending queries? Researching reps and producers?
Part of every writer’s journey is the inevitable frustration and disappointment. Some days it will be very powerful, and learning how to survive and endure it is all part of the process.