I don't see it as a disease either. Is being straight a disease? It's just who you're attracted to. I'm bisexual, and I don't see it as a disease that needs a cure. It's just a part of who I am.
But I'm sorry you're struggling with this and that you feel people don't accept you.
Honestly, I haven't felt very accepted by the LGBTQ community either. A lot of people don't seem to understand what it means to be bisexual. A lot of straight men thinks it means I'm a nymphomaniac and want to have threesomes. And I think I would be more comfortable with a woman, but women don't want to date me for some reason (maybe because I'm also attracted to men?)