Why aren't girls able to bring stronger before they've started their term?

I've been into sports for a while very soon and I always tried to lift up weights to become stronger (i was sort of not mature body wise) and nation always told me that i wasn't competent to build any muscle or get any stronger unless ive started my interval and because i wasn't mature ample yet and very well my body is still maturing and i think it's competent to gain muscle now but...

is this true in the order of girls?can someone explain why to me?and can someone explain how people could in recent times look at me and tell me that fund then?
Answers:

Birth control i stipulation help im 13?

There's lots of crap folks will tell you almost exercise that's not true. Think about it logically - If you aren't competent to get stronger until puberty why is a 10 yr old-fashioned girl stronger than a baby?

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