Every Jewish high priest is chosen from among men. That priest is given the work of helping people with the things they must do for God. He must offer to God gifts and sacrifices for sins.
It is the same with Christ. He did not choose himself to have the glory of becoming a high priest. But God chose him. God said to Christ, "You are my Son. Today I have become your Father."
While Christ lived on earth he prayed to God, asking for help from the one who could save him from death. He prayed to God with loud cries and tears. And his prayers were answered because of his great respect for God.
You have had enough time that by now you should be teachers. But you need someone to teach you again the first lessons of God's teaching. You still need the teaching that is like milk. You are not ready for solid food.