Same thing happened to me in 1974, when the job of my dreams (flying Lears for a 135 operation) showed up, and I had one remaining semester left in college. They agreed to give me time off after the busy season, in a few months and they did.
Pinnacle probably wouldn't make such an offer, but perhaps you could somehow finish up thru On-Line courses or ???
Anyway, I think your choice was just fine, and there will be others later.
I'm in my 30th year at a Major Airline (UPS). There were two other majors in my 30 years in the "121" business. My choices didn't always look so good at first, but now people like yourself will be there to replace the old buzzards like me, as we retire in the near future!
I bet you'll do just fine, when the time comes.
Good Luck!

jabr800