Grass that is here today and gone tomorrow does not require much time to mature. A big oak tree that lasts for generations requires much more time to grow and mature. God is concerned about your life through eternity. Allow Him to take all the time He needs to shape you for His purposes.
From Lamentations 3:25-26: “The Lord is good to those who wait for Him, to the soul that seeks Him. It is good that one should wait quietly for the Salvation of the Lord.”