Looking forward to something fun in the future is something that gets us all through the day. We look forward to the weekend, a vacation, a visit with a good friend. Sometimes the only thing that gets me out of bed in the morning is looking forward to going back to bed at night.
I often find myself sitting at work thinking about being anywhere else and doing anything else. Then when I'm at home my mind drifts toward what's coming up next, whether business or pleasure, and I find myself distracted from the activities at hand instead of fully engaging.
My advice is to make it a practice to be present and focused in the moment. You will be more efficient with tasks that have to be done and will get more joy out of the activities you choose. You'll be a valued friend and family member and will appreciate your relationships more.
Life moves very quickly - learn to appreciate every minute.