When you die, the rest of the world won't go on merrily without you. It can't. It's too late. You existed and therefore it's going to go on changed in some way because of your presence, because you existed.
Who are you to have an opinion? Who are you to make yourself heard? Who are you to make bold claims or have big aspirations? Who are you decide what's right and what's wrong and what should be done about it? Who are you to decide?
Actually, who are you not to?
You exist, not did exist or will exist, but do exist, here, now, in this active moment of time, in this dynamic slice of spacetime, at this point where the pen makes contact with the paper of history, perched at the precipice of everything.
If not you, who? If not now, when? If not here, where? This is your flashpoint.