In general, I would argue that college is expensive. If tuition and fees are not a concern for you, then your next biggest expense would likely be room/board and meals. If your housing situation is not an issue (i.e. you are living at home or otherwise have that piece figured out) then books are probably the next necessity that are a significant expense. I agree with Deborah - seeking out scholarships, grants, and Federal Assistance (see FAFSA's website below) is a good starting point to help defray big costs. Seeking part-time employment on or off campus is a great way to earn extra money to provide more of a buffer each semester. Renting books or sharing with a classmate are also good money savers.
I think another big piece that could help is budgeting. Creating a budget will help alleviate stress by giving you an idea of where your money is going and how much you need for each semester. Your budget has to be personalized. There is no one right answer for a given student's budget. Many factors play into it, including how much your tuition cost, whether you receive scholarships or grants, if you take out student loans, if you live on campus or commute, and if you work while attending school.
Think of your budget as a roadmap to a goal. That goal could be breaking even at the end of each year, earning some money for post-graduate life, or ensuring that you do not outspend your loan payment. I linked an article from the Department of Education below; it gives some helpful budgeting hints and examples. I highly recommend you take a look at it.
I hope this helps. Good luck!
Jacob recommends the following next steps: