Scouted by an ageny, how to convince parents to let me model?

[Helene]

Sorry, but this sounds like a classic "modeling school" scam. The fact that two girls from your school are "working" with them means that two girls from your school have been scammed.

Real agencies simply don't scour Instagram and contact minors without their parents. If you follow through with this, you're going to find out that "in development" means being required to spend hundreds if not thousands on a lessons package and photos. After that you'll get no work, because modeling schools aren't agents and can't get you jobs.

You need to check this out more thoroughly. There is an entire industry based on taking advantage of children who want to model or act.