It's really not that difficult. For formality's sake you could pick up a GED, but I think most colleges don't have a HS diploma as a strict requirement and would waive it if they did (assuming some evidence you're ready).
USA: I got into collage at 14 by just taking an entrance exam, never needed a GED. No one will stop you form going to collage, you just need to pass exams.
Another data point: I started college in the US at 14 as well without a GED or high school diploma. There weren't really any safe-guards to prevent this.
I totally understand him, I also felt the same way. But now I am on a good track in life so I would not call it a mistake. We all take different paths.
EDIT: I speak for the USA only.