Being told you look sick can make you feel sick
Repetition does the work, until a role you never chose starts to feel like you.

Make Me Smile with Miist · Ep. 48: Be AuthenticHave enough people insist you look ill, and you can begin to feel ill, even if you started the day feeling well.
Miist, a singer and podcast host, offers that example to explain what she calls the nocebo effect. She illustrates it with a crowd of people insisting you look ill, until the repeated comments can bring on the feeling of sickness.
She argues the same weight of repetition can fix an identity in place. When enough people, including yourself, say "that you are a certain person," she says, "you start to believe it," even though, in her view, "you may not be that person at all."
She says that after 20 years of performing to meet expectations, people grow scared of rejection and feel they cannot change. She compares that stuck feeling to being high on a hard climb and feeling the only path is to keep going upward. She adds that social media and conditioning certainly make this worse.
That is where her account ends. My own view, separate from Miist's, is that this raises a question worth asking for yourself. My suggestion, not hers, is to notice which labels may have been assigned by others rather than chosen, and consider whether to keep living by them.
Questions people ask
Is nocebo simply the opposite of placebo?
Yes. Placebo is when a neutral treatment seems to help because you expect improvement. Nocebo is the mirror image, when a neutral suggestion seems to cause harm because you expect trouble.
How could words change how the body feels?
Expectation can direct attention and change how the body is interpreted. If people around you keep predicting illness, you may watch for symptoms more closely and rate tiredness, nausea, or aches as stronger.
What helps if I feel stuck in a personality others expect?
Look for roles you keep performing mainly to avoid disapproval, and test small honest breaks where the stakes are low. Trusted friends, family, or a counselor can help sort which traits feel chosen and which feel assigned.