my friends hate me

So my two friends, are starting to hate me. Its because, they think that I dont like them since I dont want to hang out with them in my spare time, or skype with them. I normally just have contact with them at the school, and seriously, they are great friends, I really love them, its just, I want to be alone when I get home. Im not sure wheter to tell them about my problem or not, because I'm beginning to feel sorry for them, thinking that about me. But when I think about telling them, I'm not even sure if they would take it serious, and just take me a fool. I feel depressed -_-