Do i have to file my taxes if i made less then $9000?

First of all i am young and know nothing about taxes... My first mistake is that i didn't take out federal taxes, i didn't do it on purpose, its just something i messed up when filling out my employment papers. also will i get any money back since i didn't do this? finally, i got a check back from... show more First of all i am young and know nothing about taxes... My first mistake is that i didn't take out federal taxes, i didn't do it on purpose, its just something i messed up when filling out my employment papers. also will i get any money back since i didn't do this? finally, i got a check back from school last spring, do i have to turn that in when i file my taxes?
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