poor college student

why is it that no matter how hard you try in college, we are always scrounging for any money we can? i mean i dont know how many others are in my exact situation, but i pay for my own car, car insurance, gas, cell phone bill, and leisure. i also have a work study, and a part time job at the mall, but for some reason, i cant seem to get ahead financially. i try to work as much as i can and keep time for my school work and studying, but it just never seems to be enough. its tough being on your own financially and i think i am slowly learning all the tricks, but ANY advice will be greatly appreciated.