you are absolutely correct, that which you focus on will present itself as your reality i.e. the thoughts you think over and over again create the reality within which you reside. So choose your thoughts carefully because everything is about choices in life. I choose to think happy thoughts and when something negative creeps up, which it does because we are all human, I catch myself and immediately focus on something more positive. It does take some practice for some people, especially when they where pre-occupied with negative thoughts most of the time, but then luckily for them, they have a choice to change that.