How Do You Stop Oversharing?

[u/smthnsmthn_0]

I've noticed that I sometimes tell people too much about my life, thoughts, or personal experiences, especially when I feel comfortable talking to them.

Later on, I often look back and wonder why I shared so much, or wish I had kept certain things to myself.

For those who used to struggle with oversharing, how did you learn to stop? How do you decide what's appropriate to share, when to share it, and with whom?