Don't be discouraged, pal. That's the beauty of life. Lots of ups and downs. You're at a phase of struggling right now. The choices you make at your present life will determine how and what you'll end up doing 10 years from now. What did you expect? That you'd be driving a Ferrari as a Sophomore? Work hard. Study harder (and party,too) and it will all pay off. Don't just work hard, while forgetting to study harder. 

Now sing along. http://www.youtube.com/watch?v=LanCLS_hIo4