when people tell you that you are 'important' they do not mean important to the entirety of space and time and existence and everything that has ever been and ever will be. because we both know well enough that the sun will rise without your eyes to admire it. the oceans will grow and recede without your weary feet to marvel at how it makes you feel young again. the bones in the ground will continue to decay without you to contemplate the beauty of life or mourn its passing. the stars wouldn't die and the flowers wouldn't wilt and life would go on as if you had never graced it.
what they mean is; you are important to their own existence. the sunrise would mean nothing to them without your eyes holding it captive alongside theirs. the ocean could retreat into a crack in the ground or flood the earth and they would not care if you were not here to weep for it. the bones in the ground would decay but it would feel like theirs were doing just that. the stars in their sky would disappear and the flowers would wilt at just one glance and their life would never be the same again.
so next time someone tells you this and you make haste to deny it because of how the big bad world will spin on and the planets will laugh at your insignificance, stop and realise what they are telling you and try to think about it the next time you want to vanish for the rest of eternity.