Question about illegal immigrant getting his g.e.d and going back to his country?

Ok im 17 almost 18, i've been told to give up on high school and they right im still a freshman with no credits. So what i was thinking is: i can get my g.e.d in here save up some money and go back to mexico and go to a college there and get a career and become a professional cartoonist which is my dream :) but can i do that? Like would i be able to go into college in mexico with my g.e.d diploma? P.s do not answer with racist comments, i didnt choose to come here so **** off bi***