If someone used another one to achieve a personal interest, then the other person may describe herself/himself by the suitable noun (a non-human thing) which s/he has been used as it.
For example, if two friends went on a trip, but it appeared later that one of them has invited the other one to go with him for getting directions to their destination since the first one doesn't know the road while the other one knows it, so the friend who has been used may say to the one who used him:
— So, I was only a map for you.
Other possible situations where the following may apply:
— So, I was only a/an [experience/adventure/wallet/...] for you.
I came across a similar sentence which was written without an article, it was:
— I'm not property.
Is it normal in English to describe oneself by a non-human thing using solely the verb "be"? And, does it take articles or not?
I have tried writing similar sentences and general structures on Google Search but couldn't found anything alike.