Great question, Jonathan!
Looks like you’ve already received some great advice about holding yourself accountable, and staying engaged in the midst of your new-found freedom. To keep it short and sweet, I think the most important thing about college is balance.
As a recent graduate, and someone with experience recruiting, companies are no longer interested in a student who solely focuses on school. Yes, a student with a 4.0 is impressive. But a student with a 3.6 (for example), who had to work two jobs to pay bills, and was involved on campus, is equally as impressive. It proves that you can manage multiple responsibilities, and that you are a well-rounded person. In the midst of deciding what to get involved in, it is also important to practice self-care. For me, that meant Yoga. Find something that relieves your stress, and gives you a break from studying. You should try to work this into your week on a regular basis.
In summary, college is about so much more than classes and grades. College is a unique experience, where you have an opportunity to explore your interests and passions, and get to know yourself. Embrace it!
Like most things in life, college is what you make it, you will get out of it, what you put into it. By all means have fun, make memories that will last a lifetime, but remember the main purpose is to gain an education, and yes the fun times are part of that education as well, it call being well rounded.
So Jonathan, enjoy the ride, find someone you really trust that you can talk to and seek advice from, someone that has been there done that, and will steer you right, but remember in the end, choices are yours to make.
No-one can prepare you for college. It's a learning experience and it's different for everyone. Even the advice I will give you will probably be meaningless until you experience it but here goes:
1) Learn to fail
2) Try new things and step out of your comfort zone
3) Build relationships with your professors
Good luck :)