The Voices in my head after I turn 16

[This Story takes place in Vorpommern, Germany]

I finished up my math test before putting it into the teachers bin. Today was Friday and tomorrow was my 16th birthday. I anxiously waited as she grabbed my test and graded it, she then put it in a stack with other tests, after a few more minutes she passed them back out. I smiled. 90%, it's not perfect, but it's still good. Just then the bell rang and I basically ran out of class to pack up. After they called for walkers I walked out of the school smiling. Tomorrow we were supposed to go down to the beach and go for a shopping spree. I was so excited. When I got home my mother was cooking on the stove, " Hallo Mutter!", (Hello) "Hello, how was your day?" She said, "Gutten!I got a good grade on my test!" She looked at my paper. "Gut Schatz.", (Good dear) "Are you excited for tomorrow Khalessi?" "Yes Mutter." Just as planned, we packed tonight and we went to Ocean City, we had the time of our lives celebrating me turning 16. To end the night on Sunday with a fancy dinner, we got home very late that night. We were pooped. I woke up feeling terrible, I still had school though, I got ready and went downstairs for breakfast. "Guten Morgen, Mutter!" When I got to school I took a seat while the teacher started teaching. At first everything was fine but then i started hearing voices in my head, I held my head, what's going on. Scheisse, I cursed. "Haha, look at her, she's so stupid!" "Ugh I hate this class!" "I'm hungry!" "Zzzz." I was hearing the people in my class, their voices, I looked around, How? They weren't talking. "Look at Khalessi, she has no friends shes always alone, hah!" I covered my ears, this is why some things aren't meant to be heard.