Its not strange, but i have dated guys that have "never been dumped", and it was a bit of a blow to their ego when i dumped them! haha
But ya, its not strange, just dont let it get to your head. It doesnt mean anything.
Nope, not at all.
One of my friends was always the dumper, never the dumpee.
To this day, she is still that way.
I think the reason why you always do it is cause you fear they will do it to you first.