How did you make money right after you graduated high school?

I currently graduated from high school back in June, so that means I have a high school diploma. I currently work at McDonalds and I get paid every week. Each pay check is nearly $200. I'm only working there so that I can get a used car that can get me from point A to point B and so that I can pay for my college when I go next year. The problem is, I think I'm going to get fired because my manager said I'm not doing the drive-thru fast enough & that MCD's is a fast paste thing. So my question is, what did you do after high school to make a little money? What job did you have? I know that I got my HS Diploma but I have absolutely no idea what to do. Thanks.