Not something I'm comfortable over to admit, but yes. I also have the tendency to get a crush on people.
There was this time where I had a really big crush on someone I knew online. It started with jokes, then small talk, so on, it just clicked. But seeing as both she, and I had boyfriends I couldn't really tell her as it would set both our relationships on the line. So I waited for it to ''pass''. And I waited.. and waited.. I even tried to hate her in order to get over it, but that didn't go so well either. It hurt me more then it helped me cause. Almost 2 years went by.
Then I got here, met others like myself, and didn't feel so alone anymore. And I have to say, the crush just sort of dissolved. It's still there in minimal portions, but is no longer a burden. My boyfriend isn't very supportive about the whole social phobia/anxiety thing, so it's impossible to ask him for help regarding this subject, making it hard to relate most of time. Maybe the crush was a desperate attempt to relate to someone.
Could it perhaps be that the crushes you have on people are unconscious attempts to find friendship, love and someone to relate to?