Just realised that I have never allowed myself to seriously focus on anything. My eldest is the same. This is how I realised it's a strong trait of mine. I am suddenly aware I don't ever let myself focus. If my mind starts to focus I will deliberately think about other things.
I seem to consider having only one thought in my mind exceptionally weak and can't let this happen.
My eldest is doing it too. I'd like a more simplified thought process.