What is a word for someone who is concerned with holding up their image?

By this, I do not mean someone aware of how other people see them. I want to describe someone who is concerned with their personality being consistent. For example, someone who feels the need to always seem cool in front of his/her friends. Is there a word for this?

Solution 1:

First thought was image-conscious.

Adjective: concerned about the way one comes across to other people and the impression one creates.

Solution 2:

from you description, i would go with insecure. as in someone who is insecure of themselves, will act for the crowd, whereas a secure person is confident in who they are, and not swayed by the crowd.