You think wrong.
Jesus calls them "the twelve" in many verses. For instance, Mark 6:7 He called to himself
the twelve."
After the death of Judas they were called "the eleven." Such as here in Mark 16:14 "Afterward he was revealed to
the eleven themselves as they sat at the table."
After the election of Matthias it says he was numbered with the eleven. Acts 1:26 They drew lots for them, and the lot fell on Matthias, and he was counted
with the eleven apostles.
When it came time to elect deacons, they are again called "
the twelve."
Acts 6:2
The twelve summoned the multitude of the disciples and said, “It is not appropriate for us to forsake the word of God and serve tables.
It could not have been referring to Paul as he was not saved until chapter 9. Matthias was the replacement for Judas, not Paul.
Matthias was one of
The Twelve. An Apostle. Paul was a messenger apostle. In no way inferior to the others. Just a different ministry.
The Twelve had been told to not go to the gentiles but only unto the house of Israel (Matthew10:6). Paul was specifically called (Acts13:47) and gifted (1 Corinthians 13:18) to preach to the gentiles.
When we see the Heavenly City it will the name of Matthias which we see on the foundation stone.