Time passes, but what really happens

I was thinking that time passes, such as minutes, days, months, and years. But what does it really mean, time? How do you value or weight one moment more than another. I mean honestly. How can one moment be more important than another. Each moment or we are alive and sharing life with millions and millions of other things. So what makes one moment more important than another. Is it the difficulty one faces in a certain moment? Is it that the celebration of an event creates more of an importance? Is it that traditionally this moment/day is important, more of a tradition, rather than actual importance to current life? As each moment passes me I think about how I could have better lived that moment. For instance, I could have photographed more of the softair game, but I wanted to live the moments instead of recording them. Or I could have decided to go to another country for 6 months instead of San Marino.  I am happy that I am here, don't think otherwise, but if I would have chosen another path. And thinking of paths, would I have learned or gained the same or similar perspectives if I would have chosen differently? I don't know exactly where I am going or what I am going to do, but I know what I value. I value honesty, integrity, diversity, and loyalty.