You are making a huge generalisation. Not all TG are the same. They come at it from very different positions. Some I don't doubt genuinely have gender dysphoria and feel they were born in the wrong body. Other though may be doing it for social cachet - see ROGD above - some from a kink angle, some from something slightly more disturbing than a kink, and others just like wearing clothes of the opposite sex - what in the old days would be considered a CD or transvestite - and have no intention of a full transition. And of course we have those who identify as the opposite sex for ideological reasons.
Suicide also a very dangerous area to generalise. First, there are few if any studies that show a higher number of suicided among the TG community compared to the general population (for UK at least). Second, suicide rates don't necessarily drop after transition which suggests gender dysphoria may have been a symptom of their poor mental health and not the cause.