Sharon Buck’s lifelong dream to sing at a Red Sox game is coming true.

The 37-year-old Clinton woman will sing “God Bless America” Sunday during the seventh inning stretch.

Sunday is Maine Day at Fenway Park, where the Sox are slated to play the Kansas City Royals.

Buck will be standing on the field, belting out the Irving Berlin tune, as Kate Smith did on a record Buck’s family listened to when she was a child.

“I’m not nervous,” Buck said Wednesday. “I’m just totally excited. I feel like I’m going to burst. I really do. It means the world to me to have people believe in me so much.”

A radio personality with country music station B98.5, of Augusta, and the lead singer for the central Maine country band, Borderline Express, Buck applied in February to sing at a Red Sox game.

She didn’t hear back, so applied to sing at a Sea Dogs game in Portland, was accepted, and sang the “The Star Spangled Banner” there in May.

Then, she got a call Aug. 15 from a Red Sox spokesman, telling her that she had been chosen to sing at Sunday’s game, which starts at 1:30 p.m.

“This was a complete surprise, out of the blue,” she said. “I never thought they’d call.”

Dan Lyons, manager of entertainment for the Red Sox, confirmed Thursday that Buck will sing between the top and the bottom of the seventh inning.

A lifelong Sox fan, Buck plans to attend the game with her 5-year-old son, Anderson; her boyfriend, Chad Wood; and her friend, Amber Batchelder, all of Clinton.

You might say Buck, who co-hosts a show on B98.5 with Randy McCoy called “The Morning Buzz,” was born to perform. She is bubbly, energetic and loves to laugh.

When she was 7 and living in Connecticut with her eight siblings and her parents, Ray and Mary Everlith, there was always music in the house. Her father sang in his church and Buck remembers he would literally sweep her mother off her feet and start singing and dancing around the room.

“My sisters, Jenny, who was 5, and Wendy, 6, and I sang three-part harmony for ‘You are My Sunshine,’ for all the relatives,” Buck recalled. “I always sang the harmony part. I loved to sing harmony when a song came on the radio.”

The family moved to Maine in 1983, when she was 8. She’d sit by the radio in her Fairfield home on Saturday mornings listening to “Country Countdown.” She knew all the singers’ names and all the songs — and could identify a songwriter just by listening to a piece.

“I love music — I absolutely love it,” she said.

At Lawrence High School, she sang in chorus and show choir and was in a couple of plays. After graduating in 1992, she enrolled at what is now Kennebec Valley Community College and earned a degree in business accounting.

In the 1990s, she traveled to Florida to see if she could make it in the music business, but had no formal musical training.

“Every door was slammed,” she recalled. “I came back here and sold CDs to try to make a name for myself. I think the biggest break came when I sang with the band Alabama at the Civic Center in the late ’90s. I held up a huge sign saying, ‘Randy can you sing with me, please?’ They brought me up on stage and I sang with them.”

People started recognizing her. Two years ago, she was at a toll booth on Interstate 295 and a man asked if she was the one who sang with Alabama all those years ago in Augusta.

“I’m like, ‘Are you kidding me?’ That blew my mind, right there.”

Meanwhile, she had joined the country band A Touch of Country, based in central Maine, and was with it for five years before joining the band 95 North. After two years with that band, she worked with School Street Band until 2006 and has been with Borderline Express for the last four years.

“I’ll be leaving the band at the end of the year to start my own band, to fulfill a lifelong dream of having my own band. It’s tentatively called ‘Dixon Road.'”

She’s also appeared in musical theater productions at the Waterville Opera House and Lakewood Theatre in Madison.

Debra Susi, who directs many shows at the Opera House, recalled directing Buck in her first role — Audrey, in “Little Shop of Horrors.”

“When I cast her, I actually had no idea if she could act or even had any singing experience in background,” Susi recalled Thursday. “And then she opened her mouth. She blew the doors off the audition!”

Buck has been with B98.5 for seven years and loves her work, which includes helping to raise money for charity and entertaining listeners.

“What better way to help people than by making them laugh all the time?” she said.

Her role models in the music world include country singers Miranda Lambert (“I think she’s fantastic!”), Carrie Underwood, Gretchen Wilson and Martina McBride.

“They can sing a sappy song, but they’ve got power,” Buck said. “They’ve got presence.”

Buck is banking on her favorite team winning in Sunday’s game.

“Every sports event I’ve ever sung at, we’ve won.”

When she was a student at Lawrence High School, Buck and her sister, Jenny, and a friend, Melody Twitchell, sang three-part harmony at the girls’ basketball games when star Cindy Blodgett was playing for the team.

“We sang at every game and we won every game,” Buck said. “That year, we went undefeated. Coach Bruce Cooper said, ‘Sing at every game because every time you sing, we win.’ I don’t want to break my record.”

She also pointed out that not only is it Maine Day Sunday at Fenway, but the Red Sox are playing the Kansas City Royals, who are having a worse season than Boston.

Where Buck heads next is uncertain, but as dreams go, two of her three are becoming reality, and the third may involve heading south one day.

“I want to have my own band, sing at the Red Sox and sing at the Grand Ole Opry in Nashville. That’s been my dream since I was small.”