I really struggled academically until I had a professor teach me to learn by active recall. Basically, you need to be able to explain your notes without looking at them. I would write down questions from my notes for thirty minutes, then spend fifteen trying to answer them, marking any that I didn't know. Then I would take a break. I would try and do several of these study blocks each day. You can't procrastinate with this method, but I went from a C/B student to a straight A student in one semester. Remember to focus on content you don't know.
Find an activity to get involved in. I was overly involved because I was a tour guide, worked in a research lab, volunteered with Meals on Wheels, was a resident assistant, was in an honor society, nutrition club, volunteered as English as a second language conversation partner, and did meal planning/grocery shopping at my cooperative house. I kind of burned myself out and would recommend just joining one or two activities, but being really involved.
I highly recommend this book: https://www.amazon.com/How-Win-College-Surprising-Countrys/dp/0767917871
You kinda need to shift the way you look at things. There is a great book on this topic:
http://www.amazon.com/How-Win-College-Surprising-Countrys/dp/0767917871
I was in the same situation as you and this book gave a whole new perspective of things.
How to Win at College by Cal Newport is a great book. Here's the link to the book on Amazon.
Contact the disability center at your college. Even if you didn't have special accommodations in high school and/or you don't think you'll need them in college, follow through with the paperwork and anything else the disability center requires. You don't have to use their accommodations right away if you don't want to or feel you need them (don't feel embarrassed if you'd like to use them, nobody is going to judge you). If you do end up needing help however, everything is already on file.
Organisation will be a huge help. Buy an agenda and write down assignments and due dates instead of trying to remember everything. Don't depend on your memory or professors reminding you. You could get away with that in high school; in college, there's too much going on, and you need to learn how to be responsible on your own. Set reminders on your phone for papers and other big assignments. Have a separate folder and notebook for each class so you know where to find materials for a specific class. Avoid studying in your dorm room. Instead, study in the library or an empty classroom when you need quiet, and a local cafe (make sure to buy drinks or food while you're there) or a computer lab if you need some noise. Use the tutoring center(s) on campus for help on assignments/ papers, studying, and test-taking. There are plenty of other things you can do as well, but that's a good start. You'll figure out what works and what doesn't as the semester goes on.
I'll do you one better: How to <em>Win</em> at College
I read this book before my freshman year of college and, while seldom did I consciously follow a tip from it, I realized that a lot of it buried itself in my subconscious and was (positively) influencing my decisions.
I'm not sure how much I should attribute to the book, but I'm definitely winning at college, and the book is at least partially to thank for that.
Watch this video series, it will teach you good student habits and techniques: http://www.youtube.com/playlist?list=PLqPtvG80ufOPH3OUoMpM4OThBpIRkrw-I
If you're putting that much time in but having poor results, then it's not procrastination that's hurting you. It's how you study. Cal Newport wrote a very helpful book on the subject, read it during your next break: http://www.amazon.com/How-Win-College-Surprising-Countrys/dp/0767917871/ref=pd_bxgy_b_text_y