Like said above, college is a clean state, but it's not like high school at all. I went into college nervous too. Drop outs in high school are rare, but after hearing that people don't finish college, I was worried. After being sheltered a little by my parents, college was a more independent endeavor. I went in knowing that I need to keep my **** together otherwise it would only harm me in the end. I quit drinking, smoking, partying, etc. First semester I tried to get into parties, but it was fruitless and a waste of time. So I did a lot of growing up and studying. Besides a few games of pool, Civ 5, maybe DnD, my Fridays are pretty much studying otherwise. It's a grind, as high school was for me. In that respect, it wasn't hard, at least for me. I know a few people who are still struggling. Having an easier major might help, but in the end, I want to do what's best for my future, even if it means not partying with a bunch of randos on Friday night, waking up Saturday afternoon with a massive headache and not getting any work done 'till Sunday.
Growing up was a gradual phase for me, I'd like to think that I'm much more mature in quite a few aspects compared to my freshman year. For me, the freedom led me to doing side things that I liked in terms of volunteering and what not that wasn't really available in high school. Once I got my priorities straight, it was just a matter of tackling the day-by-day, week-by-week, month-by-month routine. Once you get into the groove of things you should be find. The problem might be how long it take you to get into the groove.