I've only told people who need to know and people closest to me who I can trust. as far as I'm aware no one has called me a nutcase, but only one person has ever really understood, and that's because she had struggled with depression herself.
the only thing I could reccomend is tell people only if you feel comfortable with telling them, and you feel they could be supportive, it isn't something you should have to cope with alone.
I hope some of that helps