I regret going to college.
I went into college thinking that I want to do something with Psychology, perhaps being a psychotherapist. The longer it went on, the more I started to realize that I really didn't want to have anything to do with Psychology being a career for me. It wasn't until my very last semester of college where I really had this epiphany. On top of this, I never really tried as much as I should have. I never failed a class, but there are some classes where I got a C or B when I definitely should have got an A if I really gave more of a shit.
Ultimately, I got my Bachelors in Psychology (which is borderline useless but better than nothing I guess), but never went for my Masters, just because I knew I wouldn't care enough and I really didn't want to be a psychotherapist anymore. I also have no experience in the field. So really, I donated a shitload of money to student loans, only to start studying for a certification for network engineering that is completely irrelevant to everything I've done in college. This certification also requires no college experience whatsoever, and I would be making double the money for entry level in network engineering than basically anything at all in Psychology.