Check out these magazines:

 

Inscription Magazine is for all science fiction and fantasy fans, which tries to publish a new story every month. It is completely free and is written specifically for teens. Check out the past stories.

Latinitas is an organization with a fantastic magazine created by and for Latina teens, on topics such as school, fashion, beauty, love,  and college. The magazine is also available online in Spanish.

Mochi Magazine is created by and for young Asian American women, with topics including fashion, entertainment, relationships, college, and nutrition.

Rookie is created by and for teens from around the world. They publish writing, photography, and other art forms.