Ever since I got my cat in December last year, he's always been a bit skittish, for example if he is sleeping and he hears foot steps come to the room he will freak out and run to the door. I don't know if this is common in cats. And also he loves to lick me, any part of my body exposed he will lick away! Is that normal? And my cat sometimes goes under the bed for no reason and will refuse to go out for a while. Is something wrong?