Don't get tangled up in the past, and don't worry about the future. Just focus on doing the present tasks with dedication and seriousness, and you'll find that there aren't so many troubles in this world. The reason you feel troubled is that you are thinking about future matters in the present, trying to solve them. In fact, if you just go with the flow, you'll realize that those issues that keep you up at night are not really problems in the end.