It sounds like you're experiencing "Déjà Vu" ...
Wikipedia wrote:
Déjà Vu - from the French for "already seen"; also called paramnesia, from Greek "para," "near" + "mnēmē," "memory") or promnesia, is the experience of feeling sure that one has witnessed or experienced a new situation previously (an individual feels as though an event has already happened or has happened in the near past), although the exact circumstances of the previous encounter are uncertain.
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Since the last years of the 20th century, déjà vu has been subject to serious psychological and neurophysiological research. Scientifically speaking, the most likely explanation of déjà vu is not that it is an act of "precognition" or "prophecy," but rather that it is an anomaly of memory giving the impression that an experience is "being recalled."
No, you're not going crazy. It's a normal event. Nothing to worry about.