你不是我所以你并不懂我
[nĭ bù shì wŏ suŏ yĭ nĭ bìng bù dŏng wŏ]
The meaning is 'You're not me, so you don't understand me'. Expresses a feeling of loneliness, incomprehension, and emotional disconnect because another person cannot possibly know everything about someone else's feelings and thoughts from a first-person perspective.