“To avoid unhappiness, frustration, and disappointment, we, therefore, need to do two things: control those things that are within our power (namely our beliefs, judgments, desires, and attitudes) and be indifferent or apathetic to those things which are not in our power (namely, things external to us).” William R. Connolly
Overthinking is an inaccurate term we mistakenly assume means we are complex thinkers. The better term is repetitive thinking; more like an OCD glitch in our programming. If we were truly overthinking, anything, then we would have a cure for cancer.
The average human has about 50 thoughts per minute; most of which we are unaware of storing, let alone identifying. So, when you ask someone what they are thinking and they say I do not know, they are not lying because we are unconscious of about 90% of those 50 thoughts. Worse yet, most of these thoughts are on replay. We tend to have a bad habit of repeating variations of the same thoughts for years.
Don Miguel Ruiz shared the Toltec belief which taught that this overcrowded thinking process, called the Mitote, "Is a thousand people talking at once while no one listens.” Akin to a ghost-like fog that blinds our path; deafens our ability to hear our own voice; and distracts us until we lose our focus and ourselves. Removing them will remove the chaos of the mind and replace it with clarity of mind.