I honestly have no idea. Like, I don't see why people say that. I know some
very interesting characters who would try some **** like that though

. But like...was your uncle born straight? No, he was like that from the beginning. It's not like I woke up one morning on my 16th birthday and said "I want a boyfriend" and maybe ten years from now decide "I want a girlfriend". It doesn't work like that. It all comes down to who you are attracted to. That's all there is. Everybody has different preferences...the world would be boring if we all liked the same thing. That's my take on it. Hope I helped a little
And another thing, maybe your uncle just doesn't understand. You can't choose what gender your attracted to...and its not a phase. If your gay and you know your gay, what kind of sense would it make to force yourself to be attracted to a girl? You shouldn't have to force yourself to love someone, cause if you have to, then it isn't real in my book. It should come naturally. He may just not understand....that's all.