Jack and Jace came out as trans together. (Fox 5)

A pair of identical transgender twins have shared the story of how they transitioned together.

Jack and Jace Grafe, 23, from Georgia in the US, said they were raised in a small town.

“It’s like being in prison except it’s in your own body. And the older I got, the harder it was to swallow.  And I was like, can’t do this for the rest of my life, I just can’t do it,” Jack told Fox5 Atlanta.

“Fear is like the biggest thing to keep you away from anything. That’s what kept me in my box,” he said.

The pair attended a private Christian school, but only confided in each other that they were transgender when they turned 15.

“With him there, we had each other’s back We looked out for each other,” Jace said.

“I feel like we’ve saved each other from a lot of really dark and depressing moments,” he adds.

“Sometimes, I wonder if he wasn’t here, if I would have been by myself, if I would have had suicidal thoughts. I’m not saying I would have, but it’s very possible. I would have been most definitely alone.”

After leaving school, they both decided to live the way they wanted to.

“But as soon as I got out of there, I cut my hair, and I changed my clothes,” Jace said.

Now, they have legally changed their genders in Georgia.

LGBT+ teenagers are at risk of poor mental health (Pexels)

“I’m just excited to finally go out there and be exactly what I’ve been dreaming about for a long time,” Jace added.

Earlier this year, a study found there are four times more transgender teenagers in the US than previously thought.

Nearly three percent of all 13 to 17-year-olds are trans or gender nonconforming, according to an analysis of a 2016 survey of nearly 81,000 teens in Minnesota.

It found that almost 2,200 identified as trans, which includes terms such as non-binary, gender nonconforming and genderfluid.

That works out at 2.7 percent of teens, around four times more than the 0.7 percent figure which a UCLA study found last year.

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