You happen to life. Life is truly what you make of it. It isn't separate from you, that is simply what you observe. Life is what happens when you take action. Every action you take creates new actions and reactions in and with events, people, places, and things. Life is created by your interactions with other events, people, places, and things. If you didn't act or interact there would be no life, there would be simply time and space.
Each breath you take, word you utter, thought you think that leads to a feeling you feel that then creates an action you take, informs and defines the life you create. Life is not something that you pick up and put on. Instead it is the sum total of the actions you take. When you choose not to take action, you choose not to participate in life creation, by taking action you are actively shaping and "happening" to life.
The life you create is your own, and at the same time it has a profound impact on the lives being created by every other person on this earth. Each action you take has a chain reaction and you may never be aware how far reaching an impact you can have. Never doubt your impact, know that the life you create is always influencing, inspiring, or serving as a cautionary tale to others.