Thanks a lot! You are amazing! "Excessively conscious of one's appearance or manner: ", that's the meaning in the context.
I met this guy("self-conscious") several times. I knew the meaning of "conscious" and I knew it's a nagtive word in the context. And it's not clear to me. Now it's crystal clear.
How to translate "self-conscious" to chinese? Would you be kind enough to tell me?