Alright, now is as good a time as ever to do a thread like this. There is not only consensus within the medical field that trans people’s identities are valid, but that sex is a bimodal model as opposed to a binary model. Let’s begin (1) https://twitter.com/realshekinahh/status/1380339295253303303
First, let’s start with a disclaimer: I am by no means a qualified expert in biology, but I do pride myself on proper research and being able to find those who are qualified, and using their work to form a more complete worldview. (2)
Let’s start with a list of reputable scientific and social organizations that affirm validity of trans people (that transgenderism is not a mental illness, that there is a difference between sex and gender, etc.) The science is not up for debate, there is consensus between...(3)
United Nations
Human Rights Campaign
American Medical Association
American Psychological Association
American Psychoanalytic Association
American Academy of Pediatrics
American College of Osteopathic Pediatricians
American Academy of Child and Adolescent Psychiatry
(4)
American Academy of Family Physicians
American Academy of Nursing
American College of Obstetricians and Gynecologists
American Counseling Association
American Public Health Association

Maybe, and hear me out here, the experts know what they’re talking about (5)
Alright, now that we’ve cleared the “trans people exist” bar, let’s talk like adults. Cornell University published a MASSIVE meta-analysis of 56 studies on post-transition mental health, with 52 indicating that transition had a positive effect on mental health (6)
Here’s a longitudinal study that followed 55 trans youths over a period of 8 years. A really cool highlight from this one is that it cross-references the general public’s psychological function as well, solidifying the assertion that transition works https://pubmed.ncbi.nlm.nih.gov/25201798/ 
Here’s a few more long-term follow up studies (via Sci-Hub)

Johannson et al. 2010

https://scihubtw.tw/10.1007/s10508-009-9551-1
(For those who have never used Sci-Hub, you can click the “save” button on the page and the pdf will appear for mobile)
Ruppin & Pfäfflin 15 (via Sci-Hub)

https://scihubtw.tw/10.1007/s10508-014-0453-5
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