Are you a sedevacantist?
I believe that those popes succeeding Pius XII will owe their maker an explanation as to why they let the opportunity first to never hold such a schismatic gathering in the first place and then, failing that, continuing the heresies.
I believe by definition and taking into consideration what' happened to the Roman Catholic Church subsequent to that infamous event I am a sedevacantist.
Unfortunately, today, awaiting a reversal in the inherent errors of Vatican II there are a lot of sedevacantists. Fortunately, many of them are properly ordained priests.