"I, PAUL REVERE, of Boston, in the colony of the Massachusetts Bay in New England; of lawful age, do testify and say; that I was sent for by Dr. Joseph Warren, of said Boston, on the evening of the 18th of April, about 10 o'clock; when he desired me, ''to go to Lexington, and inform Mr. Samuel Adams, and the Hon. John Hancock Esq. that there was a number of soldiers, composed of light troops, and grenadiers, marching to the bottom of the common, where there was a number of boats to receive them; it was supposed that they were going to Lexington, by the way of Cambridge River, to take them, or go to Concord, to destroy the colony stores.''
The stores being referred to here are guns, gunpowder, and shot. And their suppositions turned out to be correct: Gage and his troops were indeed heading to seize and destroy those stores.
Moving past your mistakes of fact and on to your mistake of philosophy: facts only have to hurt you if you let them. Learning unexpected new truths, and more importantly figuring out which biases had led you to believe old falsehoods, are good things. The less you fight the process, the less it hurts.