Bad parenting, for example a small child gets scolds and taunts repeatedly on regular basis from his parent that ,”if he will not study what he will become tomorrow”.
People with low self-esteem are more likely to overanalyze. Because they often mistrust their choices and capacities. This always pulls him back.
Over expectation from oneself that you are perfect and perfect things should happen to you is the worst feeling which causes you to overthink.
Being unable to move on to the next important issue because you keep ruminating on the same problem. This is the worst situation one can be into.
Feeling down or depressed because of your thought. This instance make you to stuck in loop of thoughts, makes you to think on the particular issue beyond it could be.