Byne, who regularly vents her frustrations on Twitter, told In Touch magazine that she has no clue to why people say she is insane, New York Post reported.
The 27-year-old retired actress said that every time she has heard it, it came from an ugly person's mouth, so she doesn't care.
"The only ones lying about me having a mental illness are people I don't talk to," she said.
Bynes said she has the support of her friends.
The New Yorker, who denied reports that she smokes marijuana, said that she does not drink because she's "allergic to alcohol."
The former Nickelodeon star also said that she is getting in shape for all the photo shoots as she likes being 100 pounds.
Bynes added that as for her future projects, she will design clothes and sing because she wants to do so and not because she needs the money.
--ANI (Posted on 02-05-2013)