Yes
A person who thinks highly of themselves is often termed as egocentric or narcissistic.
Could be superiority complex, but that doesn't always have to do with intelligence.
A person who thinks nothing is in comparison to them could be described as arrogant or narcissistic, showing a lack of humility and consideration for others' perspectives. This attitude can lead to feelings of superiority and a lack of empathy towards others.
Hypochondriac.
A person who always thinks the worst will happen is known as a pessimist.
Caring person
Dry
Probably, a narissistic person thinks only of themselves, no one else.
a know-it-all well that's what we call them
It is a word for a person who always thinks they are sick or might get sick.
A hypercondriac is a person who thinks they are always sick.A hypocondriac is a person is who is in fear of getting sick.
Optimist. The best kind of person around.