Whatever you think is true and whatever you accept in your life will tune your perception of reality, and consequently your reality.

If you think you're weak, mediocre, can't communicate, lack motivation, don't understand complex things... you will behave this way.

But if you think you're smart, exceptional, strong, motivated, good communicator, and interested in learning... it will become your reality.

You are creating the world around you, first with your thoughts, then with your actions...