This really jumped out at me.
As a college student, I've never had so many opportunities available to me at once -- nor so little maturity with which to take advantage of them.
That said, I certainly agree with taking care of low-level health problems, the sooner the better.
I'm a bit over a decade past college (36) & aside from short bouts between jobs (which never lasted very long) I've never had as much free time as I had as a student.
Most people find later in life that they actually had more means then they realized.
Always ask "Is there anything else I can do to help" after completing a task. Always be the first to start volunteering (show up early) and the last person to stop volunteering (stay late).
If you're a person of good character and genuine spirit, people will notice and talk about you. People will ask your help with bigger things. Repeat.
- Pay at least a little attention to nutrition.
- Be more willing to do things by myself; there were certain activities, for which I had a vague impression you were supposed to wait until other people invited you to go with them.
- Be less afraid of upsetting professors and other authority figures. (And I say this as someone who is a professor now!)
- Try less hard to weasel my way into the "in" crowd. (And by "less hard" I don't mean "not at all"; these efforts were worthwhile to some extent.) Conversely, there were all sorts of interesting people who weren't "popular"; try to make friends with them, or even ask them out on dates.
- Somehow found a way to relax more, although that is always much easier said than done.
* Spend as little time in your dorm as possible. Be out with people, read a book in the library or student union, join an intermural team, go to a party, whatever. Don't fall into the Weed-And-Vidya-Game pattern that college types tend to have. I suspect one of the reasons many dorms make students share a room is to force this.
* Be willing to say no to a course of study, or even to college. It's not for everyone, and I hate that we force people into it even if they don't have the money/interest/aptitude for it. The best-off people I know are CS grads, but several grads are not making great cash. Meanwhile I know (hired) electricians making north of six-figures, and I know a couple plumbers who are doing quite well.
* Most of the couples who got married after college are now divorced; most of the couples I knew in college split before graduation. Some are still a thing and happy, but the takeaway is don't limit yourself because of relationships. Date around if you can.