Of course there are individuals who regret it. There are individuals who regret any decision one can possibly make in life. But it’s worth noting that, statistically, the regret rates for gender affirming surgeries are among the lowest of any medical intervention done anywhere in the world, by a large margin.
I know you’ve heard their stories, because there are people with very specific agendas who are dedicated to weaponizing their stories. But it’s useful to remember that the plural of “anecdote” is not “data”.