I don't know what is wrong with me?

Can someone please help me. I'm sad all the time. I'm worrying about every possible thing. I am always paranoid that my friends hate me and whenever I'm with them I don't want to be with them, I just want to go off and be alone. I'm always tired and I'm sleeping way more than usual, like 17 hours a day including when I sleep at night. My eating habits have gone from too much to too little. I don't enjoy the company of others anymore. I don't care about anything, even school which i used to be so cautious about. I just don't care anymore. i've been crying a lot too, abut I've got legitimate reasons. I ever want to do is sleep. I don't know what is wrong with me. If it is something like depression or anxiety then I don't know how to fix it. What do I do? What do I have? Please help me.