Hello. So imre-reading through the early chapters of my Genki text book and decided to think a bit more about the usage of が。Namely, one of the first sentences it is introducing is 私の専攻は____です。 So I'm wondering, would it be appropriate to also do 私は専攻が? If I were to guess, it would be like the conversation is about myself, and the current statement is my major, rather the the subject of the conversation being my major.