A boy does not need to wear a girl's underwear if his crouch is getting big because the underwear is not designed for them.
You should make a list of the pros and cons, plus why you want to wear girls underwear. As a 12 year old boy, you will need to make your mom understand why you do not want to wear boys underwear.
Wear pants over top of the underwear.
yes
Some teenage girls choose to wear thongs as underwear for comfort or to avoid visible panty lines. However, preferences for underwear styles vary among individuals, and not all teenage girls wear thongs.
Some people are more comfortable not wearing underwear.
underwear and a gumshield.
Some but it is unusual
2%
Yes. The overwhelming majority of chinese girls wear granny panties.
Some girls like to wear no bra and underwear because they like the freedom of not feeling restricted in tight fitting undergarments.
Generally any color.