how do you stop oversharing compulsively?

I feel like this is very much a chronically online woe. But I think I have never kept any thought to myself, I have this compulsion to share and overexplain myself. I'm not socially inept I don't just blur out everything in public but I cannot sit quiet with an idea or a thought, I'd either text it to someone or post it to random corners of the internet. Maybe is just a desire for constant validation? But things don't seem real or worthwhile if I don't verbalise them in any sort of way.