In an Imperfect World
It began to dawn on me some time ago that having a sad thought, even having a continual succession of sad thoughts, is not the same as being a sad person.
There are situations that demand we be sad, to be normal. Part of becoming a grownup adult is the acceptance of difficulty.
The other part of this acceptance is taking action to make things less difficult. Life is hard, acceptance can be hard, but doing noting makes life harder.
But, (there's always a 'but' isn't there?) realize that you can have a happy, successful life if you just take action and do the work before you. Why? Because just being positive and doing nothing will generate nothing. Being negative and fighting everything that crosses your path can still lead to success. Always start, always take action.