Hello and welcome udoc89!
Recently, another member expressed similar concerns. What follows is more or less what I replied to him.
Although I personally accept the "sedevacantist" explanation of the current predicament of Holy Mother Church as the most accurate one, it behooves me to candidly confess that I find myself bereft of the competence and authority to oblige individual consciences thereto (Deo gratias, for that is one less thing for which I will have to render an account on Doomsday): therefore, I cannot reject as Catholic those who in good faith disagree with the sedevacantist thesis (be they SSPX, diocesan, etc.) so long as the integrity of the dogmas of the infallibility and the primacy of the Roman Pontiff as defined by the Vatican Council [the one convoked by Pope Pius IX], is kept inviolate.
The fact that you are concerned about the salvation of your soul should assure you that you have the purity and earnestness of intention that [if you prayerfully cultivate it further and persevere therein] will not allow you to fall into any errors that may imperil your soul.
If you choose to study the positions of the various traditionalist persuasions that are out there, then I would advise you to do so prayerfully, all the while earnestly practicing the self-abnegation and mortification that will ensure the efficient and effective operation of the virtue of studiousness; which shall prevent you from being seduced by idle and perilous curiosity or bedeviled by endlessly confusing polemical exchanges that oftentimes in many cases rather choke the life of the soul by so much distraction and remote occasions of intellectual vanity or acedia, rather than help the individual to attain to Christian perfection.
I would rather have you focus all your energy on cultivating the interior life by reading books on the spiritual life (written by the Saints and approved theologians) rather than focus on polemical exchanges and run the risk of committing errors wrought by some polemicists which result in their spiritual ruin. Whatever position you adopt will be of no avail for you if you do not give yourself over to works of piety, charity and penance; perseveringly practice interior and exterior mortification; and frequent the holy Sacraments and seek the spiritual direction of a devout and learned Priest.
Other forum members endowed with better minds and hearts will be glad to point out to you the intricacies of the controversial issues. But if you neglect the life of prayer, devout fulfillment of your duties of state, and works of charity and penance, all research and learning will only have a devastating effect upon you, so that you would wish you had never known about such things.
Persevere in the devotion of the Holy Rosary and to the Blessed Virgin Mary, and abandon yourself with filial confidence to the Providence of God, humbly recognizing that self and all other created or creatable things are to be spurned in order to serve more perfect the Lord, "at Whose beauty the sun and moon do marvel" (Office of St. Agnes, Virgin and Martyr).
I'm just layman, so don't cite me as an authority (please!).