With that said, college is also about infinite possibilities. Sure the social experience is fun, but you are there to learn, in fact you are PAYING to learn! Don't forget to be a dreamer....be agile and flexible to change that plan. I was a political science major and have never worked in that field. I've worked in Sales, Marketing, Event Planning, and now Operations, but I wouldn't have traded my college experience for anything. While I didn't go into the field I mainly studied, I know I built the skills and ambition I have today, during that experience. It was worth every penny, but it is also what you make out of it.
The most obvious answer for me is sometimes not the most obvious - it wasn't for me when I went to school. College is harder. Sure, it seems obvious that the subjects would be harder as it is up another level from high school. But it is harder in ways that can be unexpected. In K-12 schools, teachers are very invested in each of their students. Much of your success in K-12 is because teachers are so invested in you, pushing you and connecting with you at a very close level. While a class of 30 people can seem huge, it is often tiny compared to the classes that you will take in college. I had one class that was 300 students. One class. And in college, most teachers are about conveying information, not making sure that you learn it except through the use of homework or exams. And those can be far apart - once every few weeks rather than every day. When I was in college, many of my teachers didn't know me personally and didn't engage with you personally unless you went to their offices outside of the classroom setting. Now some classes are smaller than that, but it can still feel like one in a large crowd. Plus, since you are an adult in college (for the most part), there is not as much support. You are expected to be proactive about what you need. If you need help with an assignment, you need to ask and potential go outside of the classroom for help (like the student union). You are expected to figure out how to manage the large workload. School gets really hard right when many college students are also learning about how to be an adult. Maybe you have moved away from home and are learning how to live with new people or in a new place.
College can be a challenging experience since it is a lot of change at once. Your best bet is to be very active in your college campus. Learn about the resources in places to support you as a student. Build relationships with other students in your classes, especially the big ones. Ask for help from your teachers since they will be able to provide you direction to support if you don't know where to go. College requires a much more proactive approach to being successful.
For studying, it's much better to study in small ten to fifteen minutes sessions multiple times per week as opposed to cram studying. It's way less stressful and the information sticks better. You know how TV advertisements are trying to repeat the same message to you in small chunks multiple times per week? It's the same thing. Our brains retain information way better when its repeated often in small chunks. When you have multiple hour study sessions, the odds are that you're going to be zoning off once the first thirty to forty minutes have passed.
College isn't for everyone but you the beauty of college is to have a open mind and learn. You are going to find things you like and dislike.
Good luck! Try to shadow someones job to see if that interests you.