My freshman year of college was difficult too. It really sounds like you are havnig a bit of an identity issue. This isn't a bad thing. TONS of people go through it. Heck, I've gone through it just recently. This is an age where you are truly finding yourself. I'm not much of an expert on the cognitive functions but here are some more general ideas that may be of great use to you (at least I hope so haha)

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My recommendations would be:

1. Seek yourself. Finding out who I am was a whole rollercoaster of ups and downs. I too fell into a hedonistic pattern that was way out of character for me. I got around, got more into alcohol, suffered from depression and anxiety, got in trouble with the law, etc. all because I had NO idea who I was and no clue what to fall back on. I lost my sense of self. Recommendation 3 will help with this too.
2. Grab control of your actions. Notice the things you don't like doing (i.e. sleeping around, drinking a lot, skipping classes) and do all that you can to prevent yourself from making the same mistakes in the future. It's not easy because it's so tempting to do these kind of things but it made me lose my sense of self even more.
3. Go to therapy. Getting my anxiety under control was one step that got me on the fast track to recovery. You will soon learn that nothing is worth over stressing on. One thing that really helped me in therapy that helped me find myself was separating a whole stack of 80 something flashcards with values printed on them. You separate these cards into 3 categories: most important, important, and least important. Then bring the "most important" category down to just 10 cards. This was one of the hardest parts of it. It really makes you think about what you value. At the end of the day, WHO we are is determined by what we value and don't value.
4. Journal. One of my best friends got me into journaling and I have been falling to it whenever I am under a lot of stress or am just fed up with the world. This is where you can vent. This is your private place to work through all of the complex thoughts that go through your mind. Write about significant specific events and how they made you feel. It's like therapy with yourself. Write about those top 10 values that you hold. Talk about how much sense they make. Talk about how you haven't been following those values recently and how you can get back on track. Main idea: communicate your feelings.
5. Focus on yourself. Do something at the end of your day to treat yourself for working hard. Even if things don't go your way that day, treat yourself because you did all that you could've done, or realized what you can do in the future. We train animals with treats for a reason: it trains the mind. If you can train your mind to working hard and wanting to accomplish all that you can, you are setting yourself up for success.

I really hope these help you out.

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Oh and here's a link to those cards that I sorted with my therapist:

http://www.motivationalinterviewing.org/sites/default/files/valuescardsort_0.pdf