Sometimes its hard to always think positive because most of the time it can lead a person to failures. When a person thinks positive, he is considering himself a winner when in reality its not, that then is the reason he would think that he is a failure.
You are right, it depends solely on the person who has the capacity to make things possible not the positive thinking.
Yes. If one is pretending consciously, the subconscious will know and say "hmm... why would I be pretending if I was a real winner?" So this can and will lead to failures...
Better start your day by thinking that today i will be facing negativities. It might work on the opposite :)
Be prepared for the worst to be positively surprised by the good stuff, huh :D
You got it right, better not to expect things.
In this case you are expecting that it's better not to expect :D