If you were a teenager, you have obviously learned that you can't focus without relaxing. The two main examples are school lessons and dating. If your teacher is an asshole, it's impossible to relax, therefore it's difficult to focus and learn. If your date is sexy, it's difficult to relax, therefore to focus and learn if you are compatible. These are two different mental states, the first one is annoyance, the second one is excitement. As the matter of fact, all your adult life can be heavily influenced by lack of relaxing, therefore lack of focusing during life changing events. In adult age, you are still being distracted by annoyance and excitement. Annoying situations are being created to cause anger, followed by exciting situations to cause approval. The only way to fight this kind of distractions is to lower emotions as much as you can and use only logic to understand what you really need.