Maybe you have Attention Deficit Disorder? Sometimes it doesn't really show up or start impacting your life until adulthood, especially for those of higher intelligence.
I wasn't diagnosed until I was 40, when my son got tested. I read his results and said, "Hey...that sounds like me."
There's some sites you can check out, I'll look them up and get back with you, that will help you determine if this is the case. Also, you can be tested by a psychologist if you wish.
Medication greatly helped me maintain focus and get things done but it also somewhat dampened my, shall we say, sparkling personality. (Sparkling is so much more kind than goofy. Don't you think?
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I don't do well with TV or movies either because I'm not physically engaged in the activity. Studying is another activity which requires me to somehow create a kinesthetic connection or I won't absorb the material.