Who says Peter did? Jesus put Peter as the rock so that Catholicism will be established. Jesus is the cornerstone and Peter is one of the main rocks or something like that. As mentioned if you want to learn the truth, pray and fast and ask God directly.
The problem is you say you already know the truth and then you just argue with someone online over something you don't agree with. 😆 Don't argue online just to prove you're right or that what you've been taught is right because if you have issues with the Catholic Church which has been around for 2 millennia you should talk to the Pope. Write a letter or an email OR complain directly to God. But I guess you don't even wanna do the latter and are not brave enough because apparently you know more than anyone else about God and His teachings.
You call the Catholic Church propaganda but that's where every Christian got the Bible. Meaning all Christian denominations are also propaganda to you and corrupted by men who seek power. Are you even aware schisms happened throughout the years because of people who choose sin rather than God? Again, talk to God seriously, pray and fast until He answers your complaints and questions about the Catholic Church. Otherwise look for a priest because again you keep barking at the wrong tree.