Hi Fleur.
It sounds to me like you are either going through a rough time, or maybe even showing signs of depression. If there is help available where you are I advice you to find someone to talk to and have you tested for depression. I cannot for the life of me remember who said it, but a quote goes: "Depression is the inability to construct a future" (and to answer your question: Yes, I have felt like that countless times, even to some extent still do).
Like you said, maybe Christians aren't too good at admitting it when they go through such times, but I assure you, we do go through them. I advise you to read Ecclesiastes. You will see that even Solomon felt that life was empty, meaningless.
Hope you will find good fellowship here.