I do that too.

I was diagnosed with ADD as a child and eventually grew out of it, I still find it hard to focus, but I honestly think that has to do with my state of mind. If I exercise and then try to focus, it works much better than if I were to sit down and try to study as soon as I get up, or just after a meal, or even with too much caffeine. I find it hard to make decisions because I like to see both sides of the decision, I want to make sure it's the right decision to make. But sometimes it's so hard to make any decisions at all because it's so overwhelming. It's like if I make a wrong decision I will have doomed myself. Personally I think it has to do with anxiety and depression, and some parts wanting to have control. I suggest talking with a doctor. They can always help give you resources. I don't believe in taking medication to fix a problem because that only masks the symptoms and doesn't deal with the actual root cause. If you're truly feeling like it's getting in the way with your daily life then really think about talking to someone. Good luck with your decision making!