If you don't have any actual facts that prove your viewpoint, You may have to consider that your viewpoint is wrong

Before plastic surgery the number of transgenders in the world was - 0

Sources that prove what I am saying? Ok, giving puberty blockers to kids is harmful to them, here is the source: A study from the UK's National Institute for Health and Care Excellence reviews the negative effects of puberty blockers which is what the Swedish National Board of Health cites for their decision to restrict the use of puberty blockers: https://segm.org/NICE_gender_medicine_systematic_review_finds_poor_quality_evidence

Okay finally a source. But the thing is, there is just as much, if not more, proof that proves the opposite.
With a couple google searches I found these.

https://www.scientificamerican.com/article/what-the-science-on-gender-affirming-care-for-transgender-kids-really-shows/
This one is about how the research proves that it helps them.

https://www.washingtonpost.com/business/trans-teens-benefit-from-gender-affirming-care/2023/01/20/955f807c-98bd-11ed-a173-61e055ec24ef_story.html
https://www.statnews.com/2023/01/18/mental-health-benefits-of-gender-affirming-hormones-for-teens-persist-two-years/
These two are about how it benefits them.

https://www.theguardian.com/society/2023/mar/24/majority-trans-adults-happier-transitioning-survey
https://whatweknow.inequality.cornell.edu/topics/lgbt-equality/what-does-the-scholarly-research-say-about-the-well-being-of-transgender-people/
These two are not about Youth specifically but I thought I'd include them since they prove that it helps them generally mentally.

All of this found with a total of 3 google searches. But y'all cling to anything proving you right