Short answer: don't quit. The airlines, namely the regional airlines are not hiring now, and many would argue they are not worth working for even during good times. Change majors if you don't like your major but stay in school and get that B.S. degree. You need a B.S degree as a fall back option if you become a pilot because they are frequently furloughed from flying for a year or more. You also need one if you ever hope to meet the minimum requirements at a major airline. Fly in your spare time while you are in school, it goes well with college and serves as a useful though expensive hobby. I was in your shoes 5 years ago, I dreamed of flying all the time while obtaining an aeronautical engineering degree, and the latter has been quite useful since then. I currently fly full time, so one can do both and the only thing trapping you at a desk is debt. Keep your debt down and you will be able to fly professionally later on.