Learn by Doing (Score 1)

University is to teach you to think, and learn how to analyze, approach and solve problems in a general manner. This is especially so for undergraduates. Since computer science is such a HUGE field, there's no way for a 4 year program to make anyone an expert. But hopefully through your experience there you can think, think clearly, and apply that thinking and rationality to problem solving.

However, what you need now is EXPERIENCE. That just takes time, and it takes practice. (Think of the "Karate Kid," with the mantra "wax on, wax off". My martial arts instructor also used to tell a story of his teacher who had asked his teacher, the grandmaster, how he learned to strike so effectively. The answer was he did it 1,000 times, which gave him a good idea how to improve during the next 1,000, which helped improve the next 1,000. And so on.)

Get out. Do. Gain experience. Experience is the ultimate teacher. :-)