I doubt that it's possible that a bi-pole entity like a human-being (male/female = 2 poles) CAN exist in a biosphere designed for and only able to function through co-operative inter-relationship, Yin needs Yang, brother needs sister. Could you even breathe if you were the only entity on the planet? Trees are beings too.
I'd also like to know what happened to the other creatures? Are they gone too? Are YOU real in a cat's perception, or a cow's, or just another type of cat/cow?
I say that the outcome of being the only being on this particular biosphere (Earth) is an impossibility - your own body consists of trillions of individual, yet cooperating cells - entity's in their own-right.making complex organs - also entity's in their own-right. Take away those existences and YOU - a conglomerate, corporate entity dependent on interactive cooperation of physiological parts, cease to be.
The answer I give you then is NO, you would-not exist, as a leaf will not exist without a tree full of other-leaves. Not only that, you wouldn't know you didn't exist any more, for knowing is an act of a being and there is no being.