I am sad:((

I'm 20 years old. I feel like I should be having the best time of my life right now, but I'm not. I feel so lonely and worthless. Nobody wants to hang out with me. I always call people and everyone is "busy". I don't even know why this is happening to me Why me? Weekends are horrible for me. While everyone goes out to the movies, dancing, eating at restaurants, I just stay home and feel sad. I'm tired of people rejecting me. i pass most of my time alone by imagining things or just listening to music.all i do all day(everyday) is sit in my bedroom. i sometimes just want to die, and end the pain. i feel like a little girl trapped in a cage. i hate my appearance, and my personality. everyone around me is so much prettier than me. i feel worthless & useless. i sometimes cut myself, and i am deeply ashamed of it. i've been crying on and off all day today. i am not close with my family,but I do close with my brother before this but now he started to avoid me after have girlfriend.It really pathetic. I know people don't hate me but I guess I was meant to be alone :(I feel dead even though I'm alive..