Lose Body Fat! Help!

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So I've been working out for a few days (feelin' good) and can start feeling some muscle growing, but I still have fat.

I know it'll take longer than a few days to burn fat but this is just like when I was in high school:
I was in the best shape out of all the girls and had good muscle but never looked it because of all of the fat over it.

I also know that what you eat affects your fat but I'm a broke college girl so all I eat is either microwave or fast food.

What can I do?!
Are there any healthy(-ish) microwave food? Maybe the Lean stuff?