affectation

1. N-VAR If you say that someone's attitude or behaviour is an affectation, you disapprove of the fact that it is not genuine or natural, but is intended to impress other people. 嬌柔做作[表不滿]

I wore sunglasses all the time and people thought it was an affectation. 我一直戴著墨鏡，別人認爲是做作。