You'll have to change your point of view.
Genealogists and family historians are not interested in "Your Ancestors". They are interested in "Their Ancestors".
When you can, always give them the story from their point of view. When you talk to them, refer to people as "your great-uncle", "your ancestral home town", "your family". Don't include anything that will not be connected to them in some way.
Then you won't sound like you're gloating. You'll sound like you're interested in them, and they'll be interested in adding what they know.
In this case, you say these are folks outside your family. Then you really are in a bit of trouble. Truly, few will be interested.
What you must do instead, is not try to present your material to genealogists or family historians. To be brutally honest, we are only interested in history in general if there is some connection to the family we are researching.
You could present your material to a Historical Society. Those people are truly interested in history in general. Many of them would be interested in the Revolutionary War and would be glad to hear your personal story about your grandfather's role in it.
If you present your stories to historians with an emphasis on the history that unfolded around your ancestors, they'll be interested and you won't sound like you're gloating.