Dear Queenie,
When I’m with other people I talk too much. I don’t give them a chance to say anything, or if I do I interrupt them all the time.
Queenie, how do I learn to keep my mouth shut?—Chatterbox
Dear Chatterbox,
The fact that you recognise this bad habit is a good start.
When someone else is talking concentrate on listening to them, insist to yourself that it is interesting, and count to ten (at least!) before you say anything. If you must say something, make it a question or a comment on what they were saying and then listen to their reply.