You think that your attention is in the present moment when it's actually taken up completely by time. You cannot be both unhappy and fully present in the Now. What you refer to as your "life" should more accurately be called your "life situation." It is psychological time: past and future. Certain things in the past didn't go the way you wanted them to go. You are still resisting what happened in the past, and now you are resisting what is. Hope is what keeps you going, but hope keeps you focused on the future, and this continued focus perpetuates your denial of the Now and therefore your unhappiness.