It's OK to admit our mistakes - as much as it might hurt our ego, it's best to seek forgiveness than have the reputation of being a poor communicator.
The mistake made too frequently by most adults, including the person behind these words, is to communicate for our self opposed to our intended audience. Whether that audience be our team, our kids or a potential client.
Communication is a mammoth subject and given we spend so many hours communicating - do you ever stop and consider, how effective we are at 'selling' our message ?
The specific mistake is 'using the wrong communication approach'. For example, if you get turned on by producing 50 PowerPoint slides with gorgeous diagrams, sound bites and fonts which you cram into 30 minutes and your audience prefer detail and discussion, then you've selected the wrong communication medium and matched the incorrect learning style.
I don't need to tell you how to do it right, you can 'Google that lesson' what I implore you to do is to think, feel and do understand the preference of the audience or at least vary your communication approach.
I attempt to incorporate three approaches whenever I communicate:
Think - provide information visually - screen, paper & audio and where possible send or make available the information which I plan to cover, ahead of time
Feel - use stories, incorporate their names & their stories which you've identified when asking them questions, and
Do - engage their brain & bum - after 10 minutes people disengage.
TED got it right with the rule of '18 minutes or less' - that's more than enough time to ask someone to listen to you without any interaction. And now we see everyone in the audience happily using their device while listening (partially) because that's their style of learning & listening! You might not like it - but it's not about you!
Many years ago, a Mentor of mine shared a priceless lesson which I wish I practised more often - Communication is a game: the winner talks least and encourages others to talk/do more!