Everything that happens in the mind sooner or later becomes reality in the real world, if you think you are a loser you will be, if you think you are a winner you will continue to be one.
We have the biggest struggles in the mind, many of the fears and defeats are only in the mind, that's where anxieties and depressions come from, don't let yourself be defeated by the mind, you are the one who has to control it.
As the Bible says in Philippians 4:8 “Finally, brothers, whatever is true, whatever is honest, whatever is just, whatever is pure, whatever is lovely, whatever is of good report, if there is any virtue, If anything worthy of praise, I thought of this."