Create your own experiences

We all always have an internal dialogue with ourselves. The dialogue may contain positive or negative things. If the negative outweighs it may sound like:
I'm not smart enough to cope with this
I am not as good as the others
I can not succeed and will not do it
I always give up
It does not matter what I do, it is still not going to be better
They will discover how stupid I am
I am woman, and they will not listen to a woman
I am too young and they will not believe me
I am too young to do this
I am too old to do this

At the same time as you think the thought, you have already chosen the consequence - I will not do this, therefore there is no idea that I even try, which in turn leads to you actually will never know if you had passed it.
Brain function is so amazing that the brain actually does not see the difference between what happens in real life and what you think. So while you're thinking, 'I can not do this, your brain thinks that you KNOW that because you have already tried.
Of course this also works with positive thoughts: if you think 'I can do this and see it happening in your imagination, the image of how you do it, the brain think that you have already passed it.

If the internal dialogue, positive thoughts sounds like:
I am very clever
I am at least as good as the others
I will succeed in whatever I do
I will not give up
If it does not work in the beginning, it will be better
I am a woman but it does not matter
I am young but it does not matter
I am old but it does not matter
The age at all does not matter

Now you have already given the brain a picture where it thinks you ARE you like you describe yourself in your thoughts.

Now it's YOUR choice: to think positive thoughts or to think negative thoughts.

THAT MAKES THE WHOLE DIFFERENCE!