Mental toughness means you have to pay attention to all of your thoughts. Here is a barrier-breaking trick that I call “er-rant-ication.” It is, basically, the eradication of rants or complaints in your day-to-day work life. Think of how an errant golf ball can cost you a stroke in golf; a ranting mentality can cost you opportunities in your work life.
Here is what you do. For one full day, whenever a negative thought or complaint comes to mind, write it down. Write down even the most minor things, and try to be totally honest and aware of what you are thinking. At the end of the day, look at how many times you felt like complaining. Look at whether any of your complaints were valid.
Now, this is the most important part—this is the part where you aggressively swing at the ball as opposed to just playing it safe—deal with valid complaints and eradicate the rest so that they no longer pile up and create barriers for you.
If there is something you want to do, but a barrier you have built is holding you back, you need to work toward taking it down. Focus on the many successes that you have had in your life and repeatedly relive that feeling of success. The more you build yourself up, the more you will develop a positive forward approach. Your winning vocabulary will result in winning habits.