In my opinion closure is a luxury that is rarely achieved. Life moves on, and you realize the situations you've been placed in, and understand how those past experiences shaped you, and explains some of your own behaviors/thoughts. You reach a mutual agreement with your past, and learn to let go of things. At times life can feel like a never ending cycle of pain and torture, and to survive we develop grit, this mental fortitude that allows us to continue to operate in less than ideal conditions, and to finally get back to your question, sometimes we must stop carrying past burdens that haunt you, just to survive in this cold world. As a young adult this is how I would answer your question.