It is not in any way private. Protestantism is a late invention without a historical justification; it is simply not the Church Jesus founded. The Protestant heresies are easy to see from the Holy Scripture. For example, your “sola fide” is directly contradicted by the scripture, and your notion that the Eucharist is a symbol rather than the body and blood of Christ necessary for salvation has no basis in scripture. It is simply theological charlatanism, condemned quite publicly and for publicly known reasons by the Holy Church.
But your decision to believe all of the above, is your private judgment telling you what you believe, is it not? If not, did someone else decide for you? You have no volition? You exercised no judgment whatsoever in becoming Catholic? Extraordinary!