Double posting to expand on this:
Again, too simplistic for a philosophical approach. Do you define yourself by your experiences? If everything we accomplished in our lives is naught, do we cease to exist? When someone asks you who you are, you begin to tell them the name that your parents chose to give to you, and the experiences that you've been through in the past. This raises an important philosophical question, are we just what we have done?
I believe it's important to define ourselves, to know what we mean by "I" without referring to our accomplishments and experiences. Then, we can truly live in the present, I graduated from high school years ago, that should be irrelevant to who I am today. It's gone, I'm no longer there. Zen and Buddhist philosophy teachers often instruct students to walk across the room and back, before asking them "Where are your footprints?" This is done to free them from their past, and to live contently in the present.
I'd like to present the way of life of a tribe in the Amazon, the Piraha. The Piraha were untouched by modern civilization until the 20th century. As a result, they developed an interesting philosophy and language. The Piraha perceive the world only as it is in the present. When something can no longer be perceived, it ceases to exist to them. They do not save food for later, they have no myths about their creation, they do not bother with such concepts. It is only the here and now that matters to the Piraha.
Just thought it was interesting and worth sharing. (: