Carrie Underwood's Most Candid Interview Ever: 'Mom Guilt Is Real!'

"You feel guilty about every single thing, every decision you make, everything you do," he singer tells PEOPLE in this week's cover story

Country star (and new mom!) Carrie Underwood opens up about body issues, breast-feeding struggles, and how she makes her marriage work. Subscribe now for exclusive family photos and an inside look into how she’s adjusting to motherhood, only in PEOPLE!

She’s a perfectionist onstage, but as a mom, Carrie Underwood is navigating the self-doubt that every parent feels when it comes to having a new baby.

“You feel guilty about every single thing, every decision you make, everything you do,” the Grammy-winning superstar, 32, tells PEOPLE in a candid new interview at the Nashville-area cabin she shares with her husband of five years, NHL star Mike Fisher, and their 7-month-old son Isaiah Michael.

When it comes to breast-feeding Isaiah, she says she plans to keep it up for “as long as I can take it. It’s hard. My supply is pretty nil. We have to supplement with formula. I’m doing the best that I can, you know?”

Joe Pugliese for PEOPLE

The CMA Awards host, whose new album, Storyteller (preorder it here), is out Oct. 23, says she’s more “loosey-goosey” than she ever thought she’d be as a mom — and confesses that motherhood and marriage weren’t always where she saw her life going.

“I never dreamt of my wedding day and the perfect guy,” she says. “Then I met Mike, and I was like, ‘Wow, so now I know what I was missing.’ And the same with my son. I was never like, ‘I want kids so bad.’ And now that I have Isaiah in my life, I’m like, ‘What did I do before?’ ”

Joe Pugliese for PEOPLE

For much more of Carrie Underwood’s intimate interview and exclusive personal photos, pick up the latest issue of PEOPLE, on newsstands Friday.

— Michelle Tauber