Psychology question? I know you don't wanna read all this, but please help me.?

I have had a lot of heartache in my life. I just need help from someone who's kind and knows some stuff about psychology. When I was five my mom left my family for another man. She now lives in NY and I just miss having a mother. My father is an alcoholic who's caused much pain in my life with all hid lies about quitting.When I was younger, though i'm not sure what age, my step brother molested me a few times, and tried to me. I still struggle with having to see him and hide the truth.I also think i'm worthless, fat and ugly. The reason i'm telling you all this is I thought I was always normal, until I started looking into psychology. I do not know weather I have severe depression, schizophrenia, multiple personality's or bi polar disorder. Please, I know you can't really diagnose someone with this basic information, but tell me what you think i'm suffering from, thank you. I also am extremal paranoid, I think someones going to kill me with a knife, I have bad mood swings, they are all bad, just some worse than others, social anxiety, I lie a lot for no reason, and i know this may sound odd, but i truly do not believe people have , I think they're all liars, I also have a strong bielefe in aliens, and think they created the world, I could be abducted. I am 17 years old