The New Testament and Old Testament were gathered together and canonized by traditionalists. And unless you are reading and defining the bible by your own understanding you are not using 'the bible only'. Every concordance is written by some traditional view. Without extra biblical knowledge we wouldn't be able to understand many things within the bible, because to understand the bible we must first understand the intention of the writer, and this is often only understood when we learn of the culture or tradition the writer was writing the message for.
Those who claim to use the bible only as their foundation for what they profess as doctrinal truth are not being honest in their understanding. And even the bible only teaching is a tradition of those who proclaim it.
Now if you do not want to follow or accept as truth traditions that you are unable to verify biblically for yourself, I believe The Lord has given you the liberty to do so. As a catholic, I am asked to believe sacred scripture and sacred tradition, as interpreted by the teaching authority of the Church, is the only and complete divine revelation God has revealed to the earth. And I do believe this is true, but I do not believe the interpretation has been without error. So I take my personnel liberty in not accepting all the teachings of the Church as 'gospel truth'. Each of us must be convinced in our own minds what the truth is that was revealed in Jesus Christ, The Lord communicates with each of us as individuals and not only through the corporate body of believers. As individuals,The Lord has called us to follow him by faith, and without faith it is impossible to please God.
I do not believe as individuals we have the liberty to change or alter the canon of sacred scripture or the sacred tradition of the Church, but we do have the liberty to interpret it for ourselves for our own understanding. I believe the corporate church has been given the grace and responsibility of interpreting scripture and tradition for all believers, that they have not done so without error does not make me their judge, but God will judge them by a higher standard than he will myself or others not given this responsibility. As James wrote: "Not many of you should become teachers, my brothers, for you know that we who teach will be judged with greater strictness." James 3:1
Just a thought
Christ be with you always.