There are many groups that are treated as outcasts, bullied, and estranged but none have the suicide rate the transgender do. Your hypothesis does not match the data.
I agree, within limits, of letting parents raise their kids. The restrictions I favor are on schools and medical professionals.
I'm not sure your first point is universally true.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7317390/#acps13164-bib-0028
Quotes the various suicide rates in the Netherlands from 2013-2017 as (I cannot read Dutch so cannot check their source):
43/100k trans women
34/100k trans men
15/100k cis men
7/100k cis women
I'm almost certain there are sub groups of men with rates in the range of trans individuals in the Dutch population.