万人嫌也只怪你遭人厌
[wàn rén xián yĕ zhĭ guài nĭ zāo rén yàn]
It translates to 'Hated by many people, only blaming yourself for being disliked'. This can refer to the frustration or acceptance one feels if they believe others generally don't like them and attribute the unpopularity onto oneself instead.