Hi!
I've been in the same boat. When i came out of High School, I took a gap year and went and did Camp America, then settled into University life. 3 years later, at 22, 2 weeks out of University with my business degree i landed a job as cabin crew. And i haven't looked back!
I'm even now looking at doing Post-grad study while i'm still flying next year ( as you have plenty of 'down time' ) So that is always an option... Fly and part time study... Though i do recommend the "university experience" it was an awesome 3 years of my life and i do miss it! Hence why im going back. haha.
I'm glad i did my degree first, because its now out of the way and i can now get on with flying and cannot wait to see where that takes me!