High School = Lost 4 Years of Life

High school was an utter waste of my time..  I don't think I learned anything in those 4 years.  And I had gotten into UCLA (not the best but one of the more respectable colleges in the US.)  My SAT score before high school was 1380 and high school only managed to improve it to a 1420.

If I had to relive those 4 years, what could I have done to not waste my time by going to high school since I learned JACK in math, science, english, writing, etc.

i left high school when i was 16 and now i make $264,000 a year