Overthinkers are usually highly sensitive individuals who pay much attention to details. Moreover, they tend to be very analytical, too. They may also exhibit perfectionist tendencies and a fear of failure, with a strong need for control. These traits can contribute to their tendency to overanalyze and worry excessively.Overthinkers are usually highly sensitive individuals who pay much attention to details. Moreover, they tend to be very analytical, too. They may also exhibit perfectionist tendencies and a fear of failure, with a strong need for control. These traits can contribute to their tendency to overanalyze and worry excessively.