Why do people hate me?

Yes i make my mistakes like everyone else, but i don't deserve this! truthfully i only have 2 real friends that one i don't know how long she will stay! there's this one person that makes my life hell and spreads the rumors about me.. i really don't know what i did to her even the first incident was she stole money from me at the mall... and since than she makes my life hell and i have had these friends that will stay for half a year than get bored! and to make things worst i get called fat ugly and that i will grow old all alone. which im not fat i might have chub but im really tall fr my age and i don't think i all that ugly but all these people are starting to get to me and im starting to think that i am ugly and no one likes me.. im not emo nt even close to emo i do allstar cheerleader but can someone out there help me please.. and only real answers please