A positive outlook should increase courage, not reduce awareness.

A good outlook is supposed to make you willing to try things, not blind to what you are trying. When optimism starts requiring you to not notice problems, it has become a liability, because you are now committed and uninformed. Courage and awareness are meant to travel together.

Ask whether your positive view is making you bolder or making you avoid certain information. If it is the second, go look at the thing you have been not looking at. Your hope should be able to survive it.