“When another girl touches me I get tingly”

Hi, I’m 12 years old and I’m female. Since I was a small kid whenever another girl would touch me on purpose, I would get all tingly, and I still do. I have a friend who is a boy who I will make physical contact with just as much as my friends who are girls, but I never have the same feeling. Please, can someone tell me what that is, I’m not nervous or scared, just curious.

Thank you!