Why why why why?

why cant i trust anyone, why do people hate me so much , i have alot of friends they love me but when people first seee me they act all mean to me and they're not nice at all, but wen we talk they become nicer, but sometimes they become meaner, why do people hate me so much , and wat can i do about it i mean me and my friend added all these random people on msn and they all hate me , i mean im nice to them and all , so why do they hate me , for the first couple of times we talk they say im hot and pretty and tak a bit but then they stop talking and block me why is this