Don’t look at the past as something bad, no matter how unpleasant it was. Look at your past mistakes as lessons, some bigger and harder, some easier. Learn from it, improve yourself. Hard times will come and they’ll pass as soon as you know it. You just have to stay sane and breathe through it. It will not rain forever, the sun will shine one day or another. No present can exist without ending the past. Transience gives meaning to life. If this is not the case, it will be possible to repeat itself again and again. Then nothing would be lost forever, but nothing would be worth remembering.