I would add:
I can't do this. >>> How can I get this done?
The negative mindset is defeatist. It implies that something cannot happen, and therefore, there is no reason to try. It is giving up before considering the possibilities of success.
The positive mindset starts with an expectation of success and explores those possibilities.
If you want something bad enough, you will find a way. In the service, I told my tank crews that we do not have problems, only interesting situations. No regrets, no excuses, make it happen.