Life is difficult. All of us encounter obstacles. There are complainers, naysayers and critics everywhere. We need to rise above these obstacles and believe in ourselves.
One thing I hate to hear from people when I train them or train with them is the words "I can't". It drives me crazy. These people fail before they even start. Stop the negativity. Stop the pessimism.
There is a poem I like that goes as follows:
"There are those that do and those that don't
Those that will and those that won't"
Believe in yourself. Believe that you can and that you will succeed. Stay positive. Don't listen to what other say. Just listen to what you say. Just believe.