The `You and I` hitmaker - who is dating `Vampire Diaries` actor Taylor Kinney - still lives her life as a "free spirit" and, despite the attention her fame attracts, she is still able to behave in an "irresponsible" manner because her friends are so protective.
She told the new issue of US Vogue magazine: "[I like to] feel a little irresponsible and act like I`m nineteen.
"I`m a complete free spirit, so, even though you don`t see it, I still find time to have sex at night on the beach when no one`s around. Or roll into a bar and get f***ed up and dance with my top off. It`s just that no one ever sees that, because I have great real friends who never let me do it when I would get caught."
Gaga also admitted she hates "truth" and prefers to retreat into a fantasy world.
The 29-year-old musician - who arrived at the Grammy Awards in 2011 in an `egg` and was depicted as a motorcycle on her `Born This Way` album - said: "I hate the truth so much that I would prefer a giant dose of bulls**t any day."
And the `Bad Romance` hitmaker particularly feels like she fits in well in Japan, where the interview was conducted.
She said: "I think ... it has to do with the obsession with fantasy. I think I sort of just fit right in over here."