Seems ok, in a way. Maybe it's because you are flattered when you realise that they like you, that you start to look at them differently? And I have also stopped liking people when they dont like me, it seems pointless when not reciprocated.

I have however, in my youth, had a few crushes on my fav musicians. I guess that was pointless, but it was fun at the time.

If you're happy the way you are, then is it a problem for you?