I feel that Im going to die alone. I am very very depressed?

Im 16. I have never had a girlfriend in my life. I cant get one because Im autistic, very fat (300lbs+), and ugly. Not to mention my terrible voice, I cant talk right (I always pause and stuff), and my voice is really ugly. Im too embarrassed to sing, even in front of my family because it's so bad. Im most ashamed about my penis, its freaking tiny. Imagine the smallest, creepiest one you can think of, its like 10 times worse than that. Im infertile so I can never have kids. There's about 100 more things that are wrong with me that is a turn off to a girl. Im also really shy. Is there any hope for me? Im always really depressed about this and knowing that Im never going to find someone to be with and that Im going to die alone :(. I even think about killing myself.