18F and I feel so lost in life

I'm an introvert so I don't usually talk to anybody. Girls at school said that I'm a dumb timid girl and I can't do anything about it. They ostracized me, yell at me, put trashs inside my bag, hide my shoes. Everytime I come home from school, I will lock myself inside my bedroom and cry myself to sleep. It kept going on like that everyday for 3 years and I'm exhausted about it. Now I don't cry anymore, I have grown accustomed to it. My favorite thing to do is staring at the ceiling and daydreaming about my imaginary boyfriend.