07/14/2006 at 08:00 AM EDT
Beyoncé Knowles kept the recording of her upcoming album, B'Day,
under very tights wraps – sealing its secrets even from her father and manager, Mathew Knowles.
As the former Destiny's Child tells Giant magazine, however, she had her personal reasons.
"It took awhile for me and my dad to have an understanding," she says in excerpts from the interview on MTV.com. "When I turned 18 and started handling my business more, he went into shock. And we had our issues."
Among them, she says, "I'd say 'No' to something, and he'd book it anyway. Then I'd have to do it because I'd look bad (if I didn't)."
Admitting she and her father "would fight sometimes," the singer says that it "took about two years, to when I was 20, for him to realize, 'Oh, she is an adult now, and if she doesn't wanna do something, I can't make her do it.' "
Knowles, who's usually mum about boyfriend Jay-Z, also comments about their relationship, saying, "It's very easy. He's so quick. And we respect each other. If I have any suggestions he respects it. If he has any suggestions, I respect it. It's just, I don't know, easy. And fun."
Knowles will release B'day
– her first solo album since her multi-platinum 2003 solo debut, Dangerously In Love
– on her 25th birthday, Sept. 4. The new album's first single, "Déjà Vu," features Jay-Z.