How would i go about leaving the Army DEP?

i enlisted in the army at meps about a month ago. I got my mos which i don't like and i leave october. However, i decided i do not want to go to the army for 4 years. Im 19 now, i need to live the rest of my youth.. plus i go to college for free with pell grants cause my mom doesn't make allot of money.. Maybe after i get my associate degree in something ill think about rejoin.. How do i go about leaving the DEP?