Mr Brightside,
You are young and clearly quite intelligent, why are you so convinced that a degree is not for you?
Find a subject that you are INTERESTED in and study that. A degree won't guarantee you a job but it WILL place you higher up in the food chain. It does not really matter what the degree is in, just having one WILL make a difference.
Aviation is a VERY volatile industry and it would be wise to have an alternative option.
Besides which, you will miss out on what might possibly be three of the best years of your life!
Good luck anyway, just make sure you don't only listen to what you only want to hear.
Cheers
UTF