Once upon a time, stardust became a rocky planet. The Earth was born. Out of this stardust living creatures evolved. Eventually also humans. We are made of stardust. First it became a rocky earth, then eventually it became us. Much of the living creatures are later again transformed back into rocks. Most of the rocks you find consist of atoms that were once part of creatures. Creatures, which built themselves from atoms of still earlier rocks. We are rocks, my friend.