That's ridiculous. You've never felt upset about a girl (or guy) , or because you lost your job, or just because you had a shitty day? You can probably rationalise it away as 'well people are worse off than me' but it likely doesn't make you feel a whole bunch better.
You're right, I could have worded that differently and better. What I intended to say was that even then, there's usually some thoughts about being happy for the wonderful things I do have, bubbling in the background (not continuously, of course). And like you said, I also try not to go with the "some people have it much worse" line of reasoning.