I am a change agent. In fact, most of us are (or can be)! Through our relationships, even though it might not be our intent, we begin to influence others with our words, actions, and behaviors. This impact is defined by sociologists as "social influence theory," and it has unfolded in your life more than you know.
Since the time of our youth, as we began to understand things, we were influenced first by our parents, then by our siblings, and then by our friends and relationships in the broader community. It is probably safe to say that most every attitude or assumption you hold today is because of someone else who influenced you in that theme. This is not to say that we do not have independent perceptions, but that most of the things we think, and then advocate, have been planted in us by someone else.
Think about it; the notions you hold initiated with something you heard, read, saw, or seemed to be embodied by someone you respect. And once these attitudes get framed, we often then look to confirm them, or seek out others who hold similar views. Sometimes, when you encounter a person you respect, who has a different view than you puts you in a dilemma. Either you need to begin to rethink your viewpoint (driven by the respect you hold for that person). Or, you begin to distance yourself from this person who thinks differently than you.
So, stop for a minute now and think about the attitudes you harbor about things around us. Where did these attitudes come from? When you look a little deeper, are you so sure these attitudes are correct, or inline with your values in life? More, are you willing to change an attitude if there might be an inconsistency?