The human mind is able to achieve what it can realize and what it can believe.
Your brain can do absolutely everything. You just need to convince yourself of this. The hands do not realize that they cannot do push-ups, the legs do not realize that they are weak. The brain knows it. If you can convince yourself that you can do anything, you really can do anything.
Only the unfortunate believe in the power of fate. The happy worlds of this world attribute all the successes they achieve to themselves.