a person predominantly concerned with their own thoughts and feelings rather than with external things.
to think too much about (something) : to put too much time into thinking about or analyzing (something) in a way that is more harmful than helpful. overthink a situation/problem.
One who looks too deeply into any situation, and often over analyzes everything.
Disclaimer: This does not in any way represent or state that depression all that is stated happen as depicted. This is just a visual representation of experience and through stories told.
I personally chose to use extremes to visualize this so as to also try to communicate even to people who do not understand how depression, anxiety and all feel or how they make people feel