Get a degree.
Aviation is a changeable, fickel and unforgiving industry. Not everyone gets the job they imagine they would like so don't "put all your eggs in one basket". I would highly recommend you have something to fall back on. I've met a lot of people who have left aviation in their 30s or 40s - some by choice, others by loss of medical etc.
Find an alternative subject you like and get a good education before you proceed into flying, just in case!