Imagine you're a person who's convinced that the only thing that can make their life whole is to become the other sex than you are. You start to wear clothes stereotypically associated with this sex and use opposite pronouns, but it doesn't help; even if some people agree to treat you as a man (or a woman), it's clear they're just being polite. At this moment, you could give up with barely any consequences, but instead, you shell out a fuckload of money on an irreversible surgery that everyone claims to be life-changing.

What are the chances you'll claim to be unhappy after making such a choice? You didn't want to be a man (or a woman) when it took zero effort from you, but now you have that figured out? Are you going to get another surgery that will, at best, undo 25% of the damage the previous one caused? Admit that you mutilated yourself for nothing? No, of course not. You're happy. You're delighted. The only thing that makes you unhappy at the moment are those people who won't recognize you as a true woman (or man), but it's their fault. As soon as you get rid of transphobia, everything will be all right.

Besides, you're so deep in the rabbit hole that if your "friends" ever catch a whiff of unhappiness, they'll do everything to convince you that you're wrong—because that puts their choices in a bad light and suggests they may have made a mistake, or helped others to make a mistake. To even get the chance to allow yourself to admit you're not happy, you'd have to ditch all those people who were your lifeline for years.