(Reminder that any focus on weight should be about health rather than image or worth and that becoming obsessive about anything is unhealthy. Take it from someone with actual obsessive-compulsive disorder.)
4) Don't be afraid to change your mind. Look, I've found that most college students, by the end of their run, are nowhere near where they thought they'd be when they started. Life is like that, especially as an adult. New problems come up, new information is added to your arsenal, new experiences may alter your feelings. And yeah, it's hard to let go of the plans you had before. I'm not saying you need to let go of them all, that you have no control whatsoever (the two main goals I've had for most of my life remain the same), but you need to be prepared for things to run differently than you expected. Most college students make significant changes in their majors or even transfer schools. Many end up needing more than four years to get the job done. During my undergrad time, I dropped one major, changed my focus area within both my attempted majors multiple times, and transferred to a new school. I also found out I had OCD and that achieving my goals as an adult was going to be much harder than I expected, due to my personal limitations. It makes me feel pretty lost sometimes, but it's something I have to accept. So be ready for that moment to come.
(On a more minor level, if you are a planner like me, be aware that registration is the devil and you will have to change your planned class schedule multiple times. Like, so much. It can be really frustrating trying to get the classes you want, which is also a good reason to register as soon as possible.)
5) Be aware that your roommates come from different backgrounds. The main trouble I've had with college roommates has been a cleanliness thing. It's not the only problem I've had, but it's a major one. In basis, some people come from home lives where they were taught to do a number of chores. Some don't. Some come from homes with less strict standards of cleanliness, some from homes with stricter standards. This applies in various areas, but it seems hardest for people to understand in terms of cleanliness. The fact is you all have different standards and different skill levels, and that means you have to cooperate and communicate with each other. There has to be a compromise on what is acceptable for cleanliness, and there needs to be understanding for those who need to be taught how to do certain chores or errands. Don't be unnecessarily harsh with roommates who honestly have never learned to live the way that you do.
a) Try different stuff out! Gen eds help with this (although they can also be incredibly boring), but definitely do test out various electives. You need to be aware of prerequisites and difficulty level, but taking a class in an area besides your major/minor can be a lot of fun and teach you important skills you never knew you needed! I also recommend trying online classes. For some people, they won't work at all, particularly ones who need the lecture setting or are bad at getting work done on their own. For others, they are an incredible resource that can speed up your track through college and keep you busy during off semesters. I love them!
b) Don't stick around if you don't want to. I had a wonderful realization my junior year of college--if I didn't want to be in a class, I could drop it. You'll want to drop early in the semester, of course, because it's not allowed later on, but if you feel like a class or teacher just isn't going to work for you, take the leap. Get out! It's a totally acceptable decision to make as an adult human being, and it's super empowering, too. Find the classes, teachers, and styles that work best for you and make the most of what you're getting.
7) Balance things (i.e. take time for your social life). I'm pretty much the worst at this ever, as a disabled mentally ill introvert nerd, but looking back, I do wish I'd made more of an effort with people at my school. I had basically no friends at BYU-Idaho, which wasn't any fun. A lot of that was out of my control: as a disabled person, I had very limited transportation, so I couldn't join any clubs or go to events. But I could have reached out more to those acquaintances/almost-friends from classes who I did have outside contact with, through social media or phone numbers. Why didn't I? Kind of the OCD thing again--I thought they didn't want me in their lives. But I should've taken the chance, because I realize now that a lot of them did like me and would have enjoyed hanging out, even just watching TV at home. So be brave, little introverts, and take that step. As for the rest of you, "balance" might mean taking less time for your social life and focusing more on school, or work, or whatever. Just get your priorities in order and remember all the different aspects that make a life full. Like me, you may have a very limited amount of energy to work with, which means more extreme prioritization, but you can do it.
Images via theodysseyonline.com, colorado.gov, blog.sheaapartments.com, and jeffmcclung.com.