Is it normal? I feel super depressed about it?

Someone has to initiate the conversation. Someone has to be the first to call or text and someone has to be the one who sort of nourishes the friendship & keeps things going. Why not you? You should feel good about it. At least they call or text you back & if they don't hear from you they worry. It sounds like you are the strength of the friendship & there's nothing wrong with that.