Hope is right....
you do not need to go to the gym in order to work out and keep fit.
Most of what I do, is without the use of equipment. There is always walking, running, things that you can do without a price attached to it.
I find that when I do a lot of exercise, I am less depressed and feel a lot better about myself.
I dont know if this will help for you, but it does for me. It is worth a try.
About school...there are many options that students have. Go and see your student advisor and see what choices you have. If you explain your situation, most advisors will create an opportunity for you to "work, rest and play".