How can I prove that my experience is not just a very vivid dream?

Since the age of fifteen I have had the bothersome obsession that my mind is all that exists and that everything is just me experiencing it in my imagination. 
Weirdly you will always have instant proof that this is delusional because you sense your own reality as the most intense one. 

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  • Similarly, perhaps, social situations often feel to me as if they've already been rehearsed. With their layer-upon-layer of cultural expectations, display of learned manners and social niceties, I sometimes feel that we are actors who are only-half conscious of the unreality of it all and the innocent artifice involved.