將句子修改通順。

He never worries how others regard his behaviour.


Others 前最好冇 the，有 the 就好像是包含「其餘」的意思。
Alwas did not worry 來表達「常常不在乎」 不太好，用 never worry (從不在乎) 比較好。
句中的 as if 的用法不當，as if 本身是有「彷彿‧‧‧」的意思。

He never worried of what people's thought of his behaviour

He does not always worry no matter how the others regard his behavior.

Most of the time he won't worried that any people are regard his behavior.