I'm not sure if you can be charged with the production of child pornography simply by taking a picture of yourself. Also not sure if you can be charged with distribution simply by sending it to one person with the intent of only that person viewing it.
Now, a lawyer could correct me if I'm wrong. But even if it were illegal, there is a large gap between "girls takes nudes and is misguided in sending them to a boy she is dating" and "boy sends nude pictures of underage ex girlfriend to his friends".
One of those things might be "stupid", but the other is "malicious". Only one of those people is a victim.