Earlier today someone else posted: "Part of growing up means admitting to yourself that you don't matter."
Like a lot of things, I suspect this lends itself to all kinds of wrong interpretations. Here's what I hope is the right thing (which I posted in reply, with some editing and extension here):
With enough care and introspection you reach a point where you realize you don't mean much in the big scheme of things, but that — paradoxically — you are of vital importance to the things that you are nearest to. Everything's interdependent, which means that no one thing is the most important thing.
Now we get to the part that screws people up. If no one thing is more important than any other, then how do you decide what to do next? There's a long and involved answer, but the short one goes like this: you pick the things that will bring the people around you that much closer to liberation. Yourself included, but by putting them first you do more for your own salvation than it might seem, because you're allowing yourself to be surprised.
It's entirely possible you will matter to millions, but what's more important is what effect you will have on the people immediately around you, and yourself as well. Start there, get that right, and odds are you'll transpose that behavior onto everyone else — including, potentially, those millions many people dream about being able to affect. You'll have gotten the practice right where it counts. The rest is just gravy.