I think a lot of people have this problem. Especially as we get older look often keep thinking of the past, but if you keep looking at the past you will never pay attention to the good things ahead. It's ok to keep remembering the past as long as you still are happy with the present and look forward to the future. Life often becomes routine and sometimes you just gotta change it up some even if it's just a little at a time. Try doing something different you haven't done before even if it is something rather simple like taking a road trip. Something my gf and I do every day off is drive around and try to find new places to explore just to break away from daily life.