Hi Mohamed,
You have set a nice set of goals for your age. Many of your goals are professional and while that is great, don't forget to let the flight training experiences during private, instrument, and commercial really sink in. Like others have said, what is working today may not work tomorrow, so be flexible and don't get discouraged if things don't go exactly to plan. Remember, Happiness = Reality - Expectations. If your expectations and goals are astronomically high, you have a may have a tough path to achieve professional satisfaction. Finally, enjoy the college experience and take time to stop to smell the roses. I was very much like you in school and while I had a great time, I wish I would have smelled the roses a bit more at times. Also, don't get any DUI's. Best of luck. If you are at a school associated with Propel, you have absolutely nothing to lose by applying for it. Even if accepted, you are under zero obligation to fly for Delta if your path takes you somewhere else.
-Marcal