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Meghan Trainor, Seventeen

Dewey Nicks

Meghan Trainor's "All About That Bass" has become a body confidence anthem of sorts, but the singer herself wasn't always oozing with self-esteem.

In fact, the 21-year-old singer tells Seventeen's March issue that she "never thought I'd be a pop star" because she didn't "look like Rihanna."

"When I saw photos of myself, I would think, I look awful," she recalls. "There's a double chin!"

But after the music video for "All About That Bass" came out, it was a fan who helped Meghan to see things differently. "...I was signing autographs [and] this girl came up to me bawling and said, ‘You make me feel pretty again. Thank you,'" she says. "It really resonated with me that this girl was so gorgeous, and she didn't even know it. It's a mental thing."

Meghan Trainor, Seventeen

Dewey Nicks

"Just recently I was thinking, 'I'm confident now, and I look good,'" she adds. "and that's because I've started saying those words out loud more. So now when I see pictures, I'm like, 'Oh my God, why would I hate myself at all? I look incredible in that picture!'"

That's a good attitude, and not having those insecurities is probably why Meghan is A-OK being unattached for the time being. "I knew my life would be complicated if my dreams of becoming a success in music came true. And I knew I'd have to work hard to achieve those dreams, and that they'd have to take a front seat in my life," she tells Seventeen. "So even though I went cray in high school, now I haven't kissed a boy in forever. I keep telling myself that the right guy is going to be worth the wait. When I find the one, it's going to be like, ‘Damn, that's why you took so long! 'Cause you're awesome!'"

For Meghan's full interview, pick up the March issue of Seventeen, on stands Feb. 17.

Meghan Trainor, Seventeen

Dewey Nicks