That's nice. It was read in the liturgy in the early second century church. Did you know that?
The reason it's not in your Bible today is because groups of Catholic bishops gathered in councils between AD 380 and AD 410, and a Pope of Rome by the name of Damasus (where'd he come from?) around the same time said that it wasn't.
Here's what IS in your Bible: Isaiah 22:21-22, Matthew 16:17-19, Luke 22:31-32, and John 21:15-19.
No...the reason that book isn’t in the Holy Bible is because it was NOT Holy Spirit-inspired Scripture but a product of mere men. Men and women of God know the difference. The Roman Catholic church didn’t need to decide what writings from God they would accept or reject nor was God dependent on them three hundred years later to compile the word of God.