A big part of maturity is learning to control your emotions and take care of your responsibilities. Everybody has trouble concentrating when they go through periods of emotional turmoil, you just have to learn how to deal with it mentally.
Think about the long term. Whether there is a future for you and this girl or not, the time you spend day dreaming is wasted time. Ten years from now nothing in your life will be different from those thoughts but the long term result of not doing your schoolwork can be huge. If you learn to take care of business when you are away from her and deal with her when you are together, you'll do fine. Otherwise you'ill be daydreaming as life leaves you behind.
Answered Aug 15, 2010
Edited Aug 15, 2010