Our desires presage the capacities within us; they are harbingers of what we shall be able to accomplish. What we can do and want to do is projected in our imagination, quite outside ourselves, and into the future. We are attracted to what is already ours in secret. Thus passionate anticipation transforms what is indeed possible into dreamt-for reality.
You are daydreaming about the future because you have not tasted the present. Start tasting the present. Find out a few moments where you are simply delighting. Looking at the trees, just be the look. Listening to the birds, just be a listening ear. Let them reach to your deepest core. Let their song spread all over your being.