Puberty is scary for most kids. Bodies change, hair shows up in places, and new smells arrive. We are held hostage by our biology and some kids will experience concerning body image issues. Not all kids who express frustration with their changing bodies are transgender, but for transgender or gender-nonconforming kids puberty can be and usually is terrifying. It doesn’t matter if a child is out or not, the fear of their body changing to something that does not express their true sense of self increases their risk of depression, self-harm, and hopelessness. If your child has expressed excessive worry and panic over puberty and tries to hide their body or themselves from others, it’s important to be sensitive to the dysphoria your child may be experiencing. It’s also important to be ready to have a conversation about gender identity and the options your child can take to feel comfortable in their own skin.
Source : https://www.littlethings.com/child-scared-puberty/