Admittedly though, being selected could be a couple years off at the very least. In the mean time you'll need to eat and pay the rent. Besides, more experience can only bode well for the applicant in the long-term. NASA contributes funds to 51 colleges and universities through its Space Grant Consortia. By attending these institutions you are ensured that the curriculum for Space programs offered will conform with guidelines NASA finds acceptable.
Many schools offer degrees in technical fields, math, and science.
You will need the grades to graduate into a good Master of Science program. Obviously you will need to center your curriculum around science and the technologies. There are many degree options. Space is a multinational and multicultural-cultural operation. Students who did not explore career possibilities until their senior year could miss this opportunity.