I have always been an overthinker... Not just about t stuff but my whole life. My momused to tell me "you think too much! Turn your brain off!" as though it was something i could just DO.
Its definitely hard to control our thoughts, but it can be done. One thing i have learned is that i dont have to dwell on every thought that falls into my head. I can throw some thoughts out or move onto something else. Its tough for me but its do-able.
Theres definitely a balance needed. But i dont think overthinking is necessarily bad.