Agree with the above posters. I would strongly consider switching the major. I have a bachelor's degree in liberal arts, so that is not exactly a stable back up plan anyway. But, hopefully I won't have to use it...Do get your instrument rating, commercial, multi-engine and take your time. Enjoy flying now, and see where it takes you... Don't jump in and borrow a huge sum of money because you know it is not a good idea. I am also 25 with a PPL, working on my instrument, and face the same dilemma every day. It is frustrating sure, but I take one step at a time. Next up multi-engine, commercial, etc. Maybe have some fun and get a seaplane rating or fly a glider. Aviation is too much fun and there is no limit for what you can do with it. As far as a career goes, I wouldn't even think about it for now. Who knows, you might get a nice job after college and be able to instruct part-time. Keep flying, keep studying, and have fun.