Self-conscious (adjective)

1. Feeling nervous or uncomfortable because one is aware of being watched or judged.
2. Feeling overly aware of oneself or one's actions.

Origin:

Compound of self and conscious, from self + conscious.

Examples:

1. He felt self-conscious when he walked into the room full of strangers.
2. She became self-conscious when she realized she was the only one not dancing.
3. He felt self-conscious about his accent and avoided speaking in public.
4. She was self-conscious about her appearance and rarely looked in mirrors.
5. He felt self-conscious about being the only one not dressed in black tie.