Dear sister, this kind of confusions are mostly common. one thing you should know is that you are not the first person to be in this position. , I have also been in this doubting when I was same age as you. and your fear of not making a mistake is also so good. Coz changing religion shan't be the first move, rather first pin out and try to understand what Orthodoxy really teaches and then you will go to the other. if you want, we can study step by step about orthodox teachings and some others. And one thing you did good is bringing out your question up here.