Could you show me in that list of scriptures where the apostles inflicted pain on themselves to make themselves humble? Or make themselves approved to God? Or where they taught the church that they should do that ?
Luke 23: 23 Then he said to all, "If anyone wishes to come after me, he must deny himself and take up his cross daily 11 and follow me. 24 For whoever wishes to save his life will lose it, but whoever loses his life for my sake will save it.
This taking up of the cross is the voluntary acceptance of pain in the service of God.
2 Corinthians 4: 7 We are afflicted in every way, but not constrained; perplexed, but not driven to despair; 9 persecuted, but not abandoned; struck down, but not destroyed; 10 8 always carrying about in the body the dying of Jesus, so that the life of Jesus may also be manifested in our body. 11 For we who live are constantly being given up to death for the sake of Jesus, so that the life of Jesus may be manifested in our mortal flesh. 12 9 So death is at work in us, but life in you.
Paul is talking about the mortification of the flesh by Christians.
Romans 8: 12 Consequently, brothers, we are not debtors to the flesh, to live according to the flesh. 13 For if you live according to the flesh, you will die, but if by the spirit you put to death the deeds of the body, you will live.
Same thing. Now does that mean that mortification is always specifically physically done? No. The early Apostles looked more on fasting and other deprivations, but did not spurn physical mortification as well.