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Self-opinionated
The word for someone who thinks they are perfect is "narcissist."
Paranoid, maybe?
The term for someone who thinks they are superior to everybody is "narcissist" or "egotist."
Pensive.
The term for someone who thinks of others is "considerate."
Presumptuous ,
selfless, considerately empathetic.
pretentious
Hypochondriac
One word that describes someone who thinks they are better than others is "arrogant." This term conveys a sense of superiority and a lack of humility in their interactions with others.
It is a word for a person who always thinks they are sick or might get sick.