Her Wicked Immortals by Candace Wondrak

Welcome to Ouroboros Academy, where your headmistress is a gorgon, your teacher is a sphinx, and your friends just might kill you…
The last place I wanted to come was Ouroboros. Before awakening, I didn’t even know any of the myths were real. Minotaurs, griffins, the gods—the problem is, they aren’t the same myths everyone knows.
My name is Mila, and I’m the new Medusa.
Unfortunately, everyone seems to hate Medusa, so everyone hates me. They mock and ridicule me, resort to middle school pranks to try to break me. But I won’t be broken, and I’m not going down without a fight.
When another student turns up dead, all eyes turn to me. I didn’t kill her. Someone is trying to set me up. If I can convince my mythical, handsomely wicked bullies that I’m not the killer, maybe we can find out who wants me to suffer so badly they’d frame me for murder.