My deepest condolences to you and your family. It's never easy to cope with loss, I myself have lost my dad and my older brother within the last few years. One way to cope is that you know they are in a better place, and they would never want to see you live the remainder of your life being miserable.
Do things to make people happy man, live life for others. Whatever life you're living, always make it worthwhile to make your daughter proud.