Sibghatallah

I have problem while communicating with individuals or in meetings. I go in to in to extra details and people don't like. Why I do this? I try to bring the listener/s to the same level of background knowledge and information so that he does not have problem in understanding. Secondly I want to give the impression that I know a lot and I have got good ideas and points. This weekends has been mentioned by several people including my boss. How can I get rid of this? Thanks