That stat is marketing on behalf on the industry.
There is no reliable research on regret rates and recent research suggests it's much higher than that.
For a start, you need to be really careful that you are talking about the same cohorts, and also be really clear - are you talking about a regret rate or a detransition rate?
Most research on regret rates or on detransition is done on people who started transitioning as adults, NOT on people who started transitioning in childhood.
The OP's position - having taken hormones for their entire adulthood - is entirely different to people who transition after their adult sexual function is well established in their birth sex.
I don't know the OP's medical history of course but from what little info we have here, they may well be a person who is at serious risk of losing the chance of ever having sexual function or sexual desire if they go through with Sex Reassignment Surgery. Especially for young people who have taken blockers from a young age and then hormones this is a significant risk. Surely you're against neutering trans people?
In addition, many of the studies on this are just really poor science. For example an oft-quoted study from London's adult Charring Cross adult clinic shows a 1% "detransition" rate, based on something like 3,000 clients, which sounds solid if you don't read the detail. But in fact they didn't talk to a single client. They only looked at records of people STILL ATTENDING THE CLINIC.
The researchers did an analysis of the language looking for words that might demonstrate regret.
But surely if you want a detransition rate you need to follow-up and see how many have detransitioned after, say, 5, 10 or 20 years time. What they actually have assessed for is more like an "instant regret rate" rather than anything approaching a "detransition rate". But despite this obvious gaping flaw, organisations like Stonewall, GLAAD and Mermaids have reported this figure as fact to vulnerable young people considering transition.
Blythly quoting such nonsense stats at someone who may be about to go though this is utterly irresponsible. Please do better.