What kind of impact will I have on the lives of others? How about you? The truth is, aside from family and close friends, it's really hard to tell. You hope and may even pray, that you're making a difference but you really do never know.
I believe the solution is to just be the best person you can be and not worry about it. You can drive yourself insane by constantly wondering if you're doing the right thing, so I believe it best to act in a way that will make your mother, spouse and/or kids proud, and the rest will take care of itself.