Can you be too young to masturbate?
Everyone discovers self-pleasure at different ages. Whatever age you are, it’s totally fine.
Some girls are still kids when they discover it randomly without thinking of it as anything sexual - they’re just all "whoa, that felt good! gonna do that again.” And on the other hand, there’s girls that don’t get it all working until they’re twentysomething.
Masturbation doesn’t affect your sexual development in any way and isn’t harmful at all - it just feels great! Have fun :)