Anything in life worth achieving requires a start. If we keen putting the start off until tomorrow we will never reach our goal. Tomorrow never comes because it is always today.
Yesterday and tomorrow are illusions. The only thing we can know for certain is that "now" is happening right at this moment. We cannot change the past nor can we control the future but we can choose how we live in this moment.
Don't waste today waiting for tomorrow for tomorrow may never come.