Many transgenders are “on the spectrum” autistic, which makes social interaction difficult. Other mental issues that are prevalent in transgenders (especially females) are ADHD, depression, OCD, and anxiety.
These most often show up in the “Rapid Onset Gender Dysphoria” (ROGD) that is seen. I’m guessing that many of these kids think that this transgender solution will be a “quick fix” to their distress that manifests itself as gender dysphoria. Also as a means to solve their social difficulties as now they have a group that they will “fit in” with.
It has a lot of cult-like properties as well. (If those people don’t affirm you - well they don’t really love you. But we do. You just need to cut them off as they are a negative influence. Or - doubts about all of this are common. But you just have to be true to yourself. The sooner you get on hormones the better you will be. Etc.)
Social media is driving the “fit in” train.