What's keeping you from trying to fulfill your dreams?
Whatever it is, make the decision to not tell yourself why you can't do something. Tell yourself how you can.
Stop making excuses for not even trying.
As the words of the 900-year old Yoda: "Do. Or do not. There is no try."
Do it today. Draw a line in the sand and tell yourself it can be done. Dream of ways of how you can achieve those dreams.
Then, if a negative thought creaps into your head, smash it into the ground and tell it to stay away, you've got business to attend to.