Zahra Cooper was born a female, but in a few short years she transitioned to a boy and then back into a girl all over again.

The 21-year-old New Zealand woman spent three years living as a boy under the name 'Zane', but realised she had made a mistake transitioning at the age of 18 as she didn't feel 'right' as a male.

Ms Cooper stopped taking her testosterone pills and made another metamorphic decision to revert back to her original gender by 'detransitioning'.

Zahra Cooper (right) had started dating transgender boy Tyson (left) who was also transitioning from female to male

Destransitioning is a rare but not impossible feat of human biology.

The young transgender woman - from Kaitaia, NZ, - became filled with regret while living under her new male moniker, the NZ Herald reports.

Her boyfriend, a 17-year-old transgender boy called Tyson Kay, first thought Ms Cooper was 'pranking' him when she said she wanted to be a woman again.

'I was getting a deeper voice, facial hair, and many other changes but I just wasn't happy with them,' she said.

'It's embarrassing to go back... it sounds weird. I didn't feel like myself.'

After a long time feeling unnatural with her biological sex, Ms Cooper's endocrinologist had given her the green light to go ahead with hormone treatment.

Ms Cooper had initially come out as a lesbian but found her sexuality preference was not the biggest hurtle she needed to overcome.

In December of 2015 she began regularly taking testosterone pills and injections in a bid to transform herself into the more masculine Zane.

But when the physical changes began to set in, Ms Cooper did not feel like her true self as many transgender people do.

Ms Cooper's (right) gender dysmorphia initially confused her grandfather Victor (middle) but after transitioning back to female she is far happier and is still dating Tyson (left)

Instead of feeling relief or euphoric over her new gender identity, she developed severe depression.

Ms Cooper had started dating Tyson who was also in the middle of transitioning into a man after he was assigned female at birth, and was worried about how her choice would affect him.

Becoming Zane did not seem to cure her gender dysphoria and she became anxious she had made an irreversible mistake.

Eight months into taking the testosterone tablets, Ms Cooper hit breaking point and attempted to take her own life.

Her grandfather Victor Rakich found her unconscious after an overdose and helped to save her life.

After doing some research on detransitioning, Ms Cooper finally decided that she needed to change back to female.

Ms Cooper's biggest concern was that her decision to detransition would 'reflect poorly' on other trans people who had made the life-altering change.

'There's people out there who think it's just a phase. But it's not. It may have been for me but it isn't for someone else. Everyone is different,' she said.

She quit taking the hormonal tablets cold turkey, stopped hiding her breasts under layers of fabric and deleted all evidence that 'Zane' ever existed.

In her official re-entry back to femininity, Ms Cooper bought a truck-load of makeup and female clothes before deciding she wasn't a 'girly girl'.

She is now accepting the fact that her gender will never truly be set in stone - confusing both herself and the people around her.