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?
I have this when i am still an active gambler that made me thinking to how much i will lose and how much my family needs that surely I will never shoulder but eventually as i learn to leave gambling?
now I all do is talk to my wife , listen to her advises and even followed what she told me to do because she is my savior and my trusted one.
maybe you need to have someone beside you that can be trusting even with your life so onerthinking will gone and confidence will cover,