Self-conscious – Undue awareness of oneself; shy and easily embarrassed, feeling nervous when seen by other people
When she took the selfie she was very conscious (self-conscious) of feeling embarrassed and that everyone was watching her.
Examples of self-conscious in a sentence
I was self-conscious walking into the exam late – what if everybody looks at me?
The boy was shy and self-conscious.
I was too self-conscious to do the talent show so I watched from the side instead.