I want friends when its convenient for me
Why do you only want friends when its convenient for you?
I feel they are like toys, I play with them whenever I want to.
Friendship is a two way street. It's wrong to want to be friends with someone only when it benefits you. Your relationships won't last very long.
Not really my problem.
Don't you think they may reject you if you treat them like crap? You should try to treat them with respect and be willing to be there for them even when it isn't convenient.