Well, from a parent's perspective, we've been inconvenienced by the kids for going on 18 years now. Do we complain about it to them? No, they are our kids and we love them and we do the inconvenient stuff out of love. If one of my kids did to me what the OP did you better believe I'd be pissed. I don't know what OP's home life was like so I won't comment on if he was right or wrong, I can only tell you how I would feel in my own situation.
That being said, my kids have always helped out. I think it comes down to how you are raised, kids need to be taught gratitude, it's not some ingrained thing we all know from birth or anything. It has to be parented into you.