Don’t ever doubt yourself. Harness your power and exceed your expectations.
When you feel things are not under your control, then you will have to challenge yourself to actually control the way you respond to what’s happening. That will empower you more than anything else. Take responsibility, you are the cause and the solution of the matter at hand.
Some let obstacles and problems stop them. Don’t let what you cannot do interfere with what you can do. Don’t limit your self.
Another thing when we are on that subject. When someone (and this will happen, trust me) tells you it can’t be done, it’s more a reflection of their limitations, not yours.
It is not what you thinking, but what you do, that can change lives.