Overthinking has been a big problem in most of the peoples life. Gives you a negative attitude, affects your relations with friends, family etc. How can you possibly stop yourself from overthinking when probably you have no control of what to think?
Overthinking is like a deadly disease that can secretly kill if one is not well guilded and council. Overthink may occur as result of disappointment, betray by a trusted person or even hardship and poverty can lead one to having restless mind.
If you find yourself in such situation ensure you occupy yourself with something that will relief your mind from thinking such as music, comedy movie and game or better still go around people or look for someone you can chat with. Secondly, if you are having restlessness because of overthinking ensure you don't stay in isolated place because it can only increasing the level of your thinking and many people have died as a result of isolating themselves from people whenever they are in the situation that make them to overthink.