"Mania" or "hypomania" isn't fake. You feel it just like anyone feels anything. Whether it is the "appropriate" response to your situation doesn't make it any less real. What you do in your mind to interpret these feelings is important though. Rather than saying to yourself, "I feel so good, the world is good, life is good." That's fake. You should stop say, "I feel good for no reason." And experience it for what it is.