All of us already belong to God, so what do we have to give that is really ours alone to give? We have been made stewards and in accord with our stewardship it will be determined if and when we will become heirs with Him.
Who has completely given all back to God all that he controls?
As for fearing rejection by God, there is nothing to fear unless we fail in our part. God will not fail in His part. If we ask continuously for His help in always hearing and obeying His voice, will He not see us through to the end of our course in and with Him?