一语成谶

rú guǒ nǐ bù duàn àn shì zì jǐ shì gè dǎo méi dàn nǐ huì yī yǔ chéng chèn

如果你不断暗示自己是个倒霉蛋，你会一语成谶。

If you continue to tell yourself that you have no luck, it will turn out to be a prophecy.