"If you wish to be a writer, write"
-Epictetus
I like this quote because, quite simply, it's true. You don't need a college degree or someone's permission to write. If you think you have something to say, you just do it.
I have a Bachelor of Science in Psychology, and I love that I didn't need an English degree to publish books. Life is your training ground for good writing. Everything and everyone you encounter prepares you.
I learned a lot from studying psychology that I'm able to apply to writing. Two of the main skills I brought from psychology are outlining and backing up your statements with evidence.