Interested in Orthodoxy with an Issue

Hello! I am a roman catholic who is interested in eastern orthodoxy. I am very pro tradition which makes me attracted to orthodoxy among other reasons. Although I do have two hang ups and i am wondering if i could still be part of this lovely traditional church despite these issues.

firstly, i am struggling to believe how the holy spirit could only proceed from the father rather than the son

secondly, i find the idea of orthodoxy being the only true church odd since i believe all of us christians are brothers

im not here to disrespect anyone or attack you, id just like to know more about this church.