The fact that there is only one of you means that others will have to wait until you arrive on the scene of their lives, because there is not another of you to be there until you get there. Your uniqueness is sorrowful because once you are gone there will not be another of you to come in this present world.
You mean something because God meant to make you. Jesus Christ died for you that through your redemption the wonder of who you are will shine more profoundly because of who He is in your life. Jesus takes away our sin when we ask Him to and when He does (through His shed blood) the Holy Spirit makes these earthen vessels glow with God's Glory.
- Psalm 139:14 I will praise You, for I am fearfully and wonderfully made; Marvelous are Your works, And that my soul knows very well.15 My frame was not hidden from You, When I was made in secret,
And skillfully wrought in the lowest parts of the earth.