Assertive mood: Stop making excuses to write your script later. If you have real passion for screenwriting, you will begin creating compelling stories that give people escapism. Focus on one creative idea you can expand on right now and just go for it. Plan the process, enjoy the steps.
There is no guarantee we will see tomorrow. We don't have all the time in the world to keep postponing our dream. Screenwriting is as simple as just starting a script. Don't concentrate on whether your first daft is good or bad. Get out of your head with all those fears of people judging, criticizing and insulting your work and you. Quit thinking it is too hard to make it in Hollywood. You are good enough!
Having a positive outlook to write at will is better than using positive reinforcement as a reward structure. Empowering our writing to improve this world is better than chasing fame to get attention. Write movies because you believe your dream can inspire others to also do great things.
Behind the scenes you will be a hero. Just write the script!