Why do i not like anyone?

over these last couple of years, i have really started to dislike people. i think they are so rude and nasty and are all out to get me. you may think ooo crazy woman but im not lol. i have lots of friends, and like 3 really close ones. but i am so distant towards over people? i hate making eye contact with them and i get so nervous and paranoid too lol. i have got better though before i couldnt even go on a bus or anything cause it made me feel so sick to be around people. i just want to know what is wrong with me and why the hell i am like this.