How do you even know which doctrines are true and which are false?
If you reject "Club Infallible", then what is to stop you from arbitrarily picking and choosing (as Caminus falsely accuses me) your doctrines?
Why would God, who is infallible, come to earth and die to establish a Church, promise to teach all truth through Her, specifically give St. Peter the keys, pray for him to have an unfailing faith and three times admonish him to feed the flock- only to allow doctrinal teachings to be subject to the corruption of our fallen nature?
Do you deny that St. Peter himself was given the gift of infallibility in defining the faith? Do you assert that it was given to all the Apostles, but that their successors would not inherit it? How does the Church have the Holy Ghost, if not in Her Solemn Magisterium?
Who can you trust to be the interpreter of Scripture? Yourself? The Holy Ghost, speaking to your conscience? Is there some way that you know that YOUR doctrines are correct, when so many other Protestant denominations (among which is your "Old Catholic Church") claim the same thing, despite contrary doctrines?
Do you deny that the Church is Divinely instituted? It would seem yes, because this is the only way that your position, that popes are incapable of speaking infallibly on matters of faith and morals, could make any sense, and then what is your faith based on?