My feelings

So, idk whats going on with me. Like 30min ago i was so happy and taking fun pictures and videos then, the i started crying and feeling alone and sad and depressed and i feel like i cant do shit with my life and im only 15 and idk i have all this family and friends and im still feeling mad alone. And everytime i eat i start throwing up and feeling sick and im always tired and i dont ever wanna leave my room nor my bed. And im tired of pretending that im okay. Im tired of it. Im killing myself trying to pretend that im okay. I act like a bitch to everyone because i cant show my real emotions. And idk what to do or what im feeling or why im feeling it.