But full of what? Lemon juice or lemonade?
That depends entirely on you. There are many things that happen in your life, some good, some bad, some easy, some hard. But your life is about you and the choices you make. It is not about what happens to you and around you; it is about how you react to those events.
Choose a positive attitude. No, you won't be ecstatic every minute of the day, nor should you. But you can turn a lot of lemons into lemonade, so fill up your glass.