Pansexual coming out to my cousin.

I came out to my cousin awhile ago. She was fine with it. But she says it's pretty disgusting. And whenever I talk about a certain girl. She won't pay attention or tell me is just a phase. It just makes me feel closed in. Cause I don't care about who accepts me or not. But it just gets irritating when she keeps telling me it's a phase. Even if it is. Then what's the problem? I'm pretty sure it's not. Cause I never really stricted my dating choices.