Yes, you passed up the chance to create beautiful music with lifelong friends. But you also unknowingly saved yourself decades of being made fun of. Also you probably wouldn't have gotten accepted. You sing terribly.
Boooo-ring. You have the rest of your life to hang out in cities/towns/rural wastelands. Why waste your time doing it during the only four years you'll get to hang out in a manicured, summer camp-like, exclusively populated li'l bubble o' fun? The only possible reason is that as a college student, you'd have a unique opportunity to piss off locals with your intellectual superiority complex and get in bar fights that you'd definitely lose. Pass.
You might worry that you've missed your one shot at hitting on tons of young, available people with similar interests as you, but that's just not true. There are literally millions of other attractive people out there in the real world who'd be more than happy to reject you.
The keg, the giant room of vaguely familiar-looking people, the Lady Gaga music, the constantly checking your phone to see if anyone's at a cooler party than this party, the awkwardly standing alone while your friends are all flirting with someone, the brief attempt at dancing before you realize that you still aren't drunk enough for that: If you've been to one college party, you've been to 'em all.
The only thing dumber than regretting not partying enough is regretting not studying enough. At least parties are SOMETIMES fun. Studying is never fun, and it's also pointless because absolutely no one cares about your college grades in the real world. And to be honest, you're probably not going to get a job for a while no matter how good your grades are. "NOT IN THIS ECONOMY!" - your grandpa. But seriously though, you're not getting a job.
Were you not listening before? You're not getting a job right after graduation, not even if you major in something boring that translates directly to a lucrative field of work. So go ahead and major in something fun. At least now the job you're not getting is a job you'd actually want to do.
First of all, you don't need to regret not taking any pictures because other (more annoying) people took pictures of EVERYTHING and then tagged you in them. But even if you have little to no photographic evidence that you a) went to college and b) had fun occasionally, trust that it's better this way. Now, as your brain slowly slides into senility, you can choose to remember yourself looking way sexier and having far better posture than you ever did in reality.
Comfort zones are awesome. That's why they have the word "comfort" in them. You may never know if you would have LOVED geology, but you do know that you enjoyed every minute of sleeping in you did instead of taking that 8am intro class. And honestly, what's more important?