Ms Katie Stubblefield was just 18 when she attempted suicide by putting a hunting rifle below her chin and shooting herself.

She survived the shooting but her suicide attempt put her on a journey to become the youngest person in the United States to receive a face transplant.

Now, at 22, she is featured on the cover of National Geographic magazine's September issue, released on Tuesday (Aug 14), in a piece titled "The Story of a Face".

She is also featured in National Geographic's full-length documentary Katie's Face.

According to a report by CNN, Ms Stubblefield suffered several problems in the days leading up to her suicide.

She had chronic gastrointestinal problems which she had to undergo surgery for, she had just broken up with her then-boyfriend, and her mother was abruptly fired from teaching at the same school that she attended.

At an all-time low, Ms Stubblefield made the decision to kill herself.

Ms Stubblefield lost parts of her forehead, her nose and sinuses, most of her mouth, and the bones that make up her jaw and structures of her face. Her eyes remained but they were badly damaged, news reports said.

Cleveland Clinic's Dr Brian Gastman, who attended to her after she was transferred there some time after the incident, told National Geographic that Ms Stubblefield's injury was one of the worst face traumas he had ever seen.

He said: "Her brain was basically exposed, and I mean, we're talking seizures and infections and all kinds of problems. Forget the face transplant; we're talking about just being alive."

Ms Stubblefield told National Geographic that she has no memory of her suicide attempt or the many surgeries to mend her face - her parents were the ones to tell her.

She said she was shocked: "I never thought of doing that ever before, and so on hearing about it, I just didn't know how to handle it."

"I felt so guilty that I had put my family through such pain. I felt horrible."

In 2017, three years after she shot herself, it was decided that she would have a face transplant - an experimental and extensive surgery, and only the 40th known to the world.

Her donor - Adrea Schneider - was a 31-year-old woman who died of a drug overdose.

While Ms Schneider was a registered organ donor, her grandmother Sandra - who reportedly adopted her when she was 11 due to her mother's drug addiction - had to approve the donation.

According to National Geographic, Ms Schneider's 15-year-old son knows that his mother saved the lives of seven people, but is unaware her face was among the organs donated.

Ms Stubblefield does not look like Ms Schneider as the face moulds to the former's body.

The procedure involved replacing Ms Stubblefield's full facial tissue - transplanting the scalp, forehead, upper and lower eyelids, eye sockets, nose, upper cheeks, upper jaw and half of lower jaw, upper teeth, lower teeth, partial facial nerves, muscles and skin.

The surgery, which took 31 hours, was a success.

Ms Stubblefield now takes medication to reduce the risk of organ rejection, and will do so for the rest of her life. She also has to continue with physical and occupational therapy for the time being.

With her new face, Ms Stubblefield now has a future to look forward to. She hopes to go to college and eventually find a career in counselling and motivational speaking.

"So many people have helped me; now I want to help other people," she told National Geographic.

She hopes to speak to teenagers about suicide prevention, echoing what she told CNN: "Life is precious, and life is beautiful."