Positive thinking will make a positive effect.
We have to get used to think positively.
If you are not brave or confident enough to make a choice, it means a skepticism.
Here's an example.
When you do a math, when your brain says "can't", your mouth will say "can't" and your hand will can't do it too. And those things happen because of the first thought.
So, it's important for us to think positively.
Plant in your heart that,
"I can do it, I'm brave enough, I can pass all problems, I can reach my dream, I deserve it!"
As a Moslem, so InsyaAllah, you can get what you want. Amin.