If you’re still wondering, physics is actually working on answering the question from whence we came. From an article in the LA Times:
As particle physics revolutionizes the concepts of “something” (elementary particles and the forces that bind them) and “nothing” (the dynamics of empty space or even the absence of space), the famous question, “Why is there something rather than nothing?” is also revolutionized. Even the very laws of physics we depend on may be a cosmic accident, with different laws in different universes, which further alters how we might connect something with nothing. Asking why we live in a universe of something rather than nothing may be no more meaningful than asking why some flowers are red and others blue.