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It is possible to get an annulment in Nevada. Nevada has one of the more expansive annulment statutes of any of the 50 states, but you still must determine whether or not your marriage qualifies.
Here is a link to the Southern Nevada Legal Aid site (there is self help information here that can assist you with an annulment if you find that your marriage does qualify, although given your summary of facts, you may want to retain an attorney anyway): http://www.familylawselfhelpcenter.org/self-help/annulment/overview-of-annulment/44-grounds-for-annulment-in-nevada
Here is another article which discusses this in a little more detail, and helps discuss what an attorney can help provide you with: https://www.avvo.com/legal-guides/ugc/annulment-in-nevada---its-easier-than-you-think