Nope, nobody said treasure was supposed to or had to be keyed to your character. I actually much prefer these types of games- it takes characters down aspects of the game and roleplaying few people consider. You could give it to a paladin in exchange for a favor to be named later, sell it, decide to pursue paladin traning yourself (perhaps explaining it as holy visions from having the sword), etc. Don't be pissed about it- think about how many possibilities have opened up.