Regret.

We do things that we want to, but shouldn't. But we always think, no worries. We have so much time to regret it later. So much time to make UP for it. That's the life we lead, where we spend time dwelling on the past, crying over our mistakes, regretting actions that we made. Ironically, the more we loved it at the moment, the more we hate it in the future. And that is how people waste their life away. No, not by doing stuff they'll regret later, but by doing the actual regretting. We waste time on the past, instead of the present. Spending every second of our life just rethinking the past and blaming ourselves, isn't the way to go. But that's how we go. That's how we are going. That's how we'll go. And one day, once we're gone, there will be nothing that reflects us except our guilty emotions and pathetic regrets.