If we hold tightly to anything given to us unwilling to allow it to be used as the Giver means it to be used we stunt the growth of the soul. What God gives us is not necessarily "ours" but only ours to offer back to him, ours to relinguish, ours to lose, ours to let go of, if we want to be our true selves. Many deaths must go into reaching our maturity in Christ, many letting goes.
One does not surrender a life in an instant. That which is lifelong can only be surrendered in a lifetime. Nor is surrender to the will of God (per se) adequate to fullness of power in Christ. Maturity is the accomplishment of years, and I can only surrender to the will of God as I know what that will is.
Maturity starts with the willingness to give oneself.