There is so much I want to say, Mcbel, that I have to write a hub on this topic.
There are several things I would advise with the understanding, of course, that I come from my own biased perspective, but that perspective is based a bit on observation through many years and having a daughter "in the industry" and from my husband's son being a sound engineer in Hollywood. Given that, I would suggest the following:
1. My belief is that you are exactly right in your view that a college degree opens your mind to the world and to ideas and ways of thought. Nothing is as valuable as being presented with ideas from Sociology, Psychology, Philosophy. It changes everything.
2. For your personal growth, try to eliminate the concept of "arrogant, closed-minded people" and open up your heart and mind to the fact that we're all just here on this journey together and come to our beliefs from our backgrounds, fears, and attempt to make sense of it all.
3. Understand that your parents ultimate dream for you is to see you happy and fulfilled. Period. Your happiness brings them happiness. They have their own perceptions, based on their life, that bring them to conclusions about what will make you happy, but ultimately trust that their intentions are pure. Presenting your case from a basis of substantiated facts will serve you well. That will take work on your part.
4. If you took the Strong, Campbell, or other Interest Inventories in high school, dig them up and re-read what they indicated. If not, run over today to your nearest community college career center and ask how much it would cost for a battery of Interest Tests. The Myers Briggs might be good for you as well. You can do that online, but pay for the total analysis of the results. I understand that you know your interest is in screenwriting, etc. but give yourself the gift of a complete picture. Why? Read 5.
5. My daughter has a degree from NYU Tisch School for the Performing Arts and was on tour with the Broadway Production of Mamma Mia.She does stand-up as well and writes screen plays. My husband's son graduated from the prestigious Berklee College of Music in Boston and had to start as as "a runner" in a music studio in LA because that's just how the music industry rolls. My daughter still struggles financially. Steve owes about $100,000! Therefore, if anything on those interest tests allows you to "walk and chew gum" (earn money on the side in this crazy industry) find out. So much more to say...