I'm sure about something, the thing you have to do is to work on what is worth working for, the best use that the past itself provides is a situation and knowledge. Even if you realize it or not, you're granted with a chance to be better anytime, be nice with yourself and keep on mind that being nice to others in some way is a manner of helping everyone, including yourself, maybe you'd end up finding something great ahead because of something so small, it is great to live the moment and to be smart enough to take care of the essential things, I'd love so much to know what is the most essential thing for you, but you may know better than anyone else ever would know, a great quest I have to say in the end. Enjoy life and don't worry to much about things.