My only suggestion is that you try to get as deep into the major as quickly as possible. Remember that you'll be breathing mathematics for four years. Grand visions of changing the transportation infrastructure will die out the day you get a professor that makes learning as much fun as sticking your nuts in a vice.
It's not that the material is hard, it is that you need to make sure your passion is aligned with your goals. If you can keep your motivation up and get involved with extracurricular programs (FSAE, etc.), you'll have an awesome time.
- LostCause