Every single moment is a single experience in your life you. It is not you to decide wether you should have lived it or not. You lived it. Either positive and or negative experiences are experiences which constitute your way of life. And it is not about complaining about them or about some of them. Of course you can do so. But, they were certainly worthy. Even if you are not able to see why. Even though, you should try taking the most benefits from those experiences. They are part of your personality as well in that sense that they had/have/will have an influence on you and on your way of life.
Get through life being open minded and ready for any kind of experiences. Make the best of it.
Frédéric de vOLTAIRE