First Alien Contact

It's a story about a crashed ship. This ship crashes, but its occupant, along with his ship, are not completely corporeal. When a teenager approaches this ship, the alien reaches out to greet him, but the boy is consumed in the process. The alien unwittingly assumes the boys identity, and tries to sort out his life. When the local drug store's sliding door doesn't open for him, the alien/boy begins to wonder what happened. With the help of the store owner, the alien/boy becomes less alien and more human, but the store owner is left with the knowledge of the nature of this being.