Denarius of Caligula are very rare and valuable, so there are many fake copies around. From what I can tell from your pictures it appears to be one of those copies. If possible clearer and closer images would help.
I'm going to move this thread over to the Ancient coin section for more comments.
Unfortunately your coin is definitely a modern forgery. The style is completely off. looks like a reproduction rather than a cast of an authentic coin.
Where did you find the coin? Are you able to return it for a refund?
If not, don't despair, we've all been there before. Stay here and you'll learn lots about ancient coins and how to best avoid fakes.
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