I'm afraid we can't make that decision for you. It's your life and your future at stake. I wouldn't pay attention to strangers online as much as I would yourself. What do YOU really want? Do you want to pursue a career with in your friend's business or forge your own path? The latter requires time/money/patience but potentially has a big payoff depending on how you handle things. Just my opinion, but I say stay in school and get a degree. I think that gives you more leverage in the real world. Looking back, had I left college without a degree, I'd have limited options and risk being complacent. I'd imagine your parents are paying for your school with the expectation of you graduating. But again, just my opinion.
Current: AW/SO F10 M5 H&R Springs, 12mm/10mm Spacers
Sold:Imola Yellow RS4-KW V3, MTM 10mm spacers, Hotchkis rear sway bar, APR Stage 1, Milltek Catless, RNS-E, Euro RS4 Flat bottom Steering Wheel