Yeah there are people in the world far worse off than you. There are people in the world far worse looking than you. There are people in the world who have seen/been through things beyond your wildest comprehension...but.
All a person can rationalize is their own experiences, their own mind. Ten people can walk down the same street, day after day and whilst the street may remain constant, each one of those people will feel differently about that street. For one it might be a street that leads home, to a happy loving family, so their journey might be in high spirits. To another person, that street might be the place where they lost a loved one. Another might pass through on the way to work or school and not even notice the little things. Another could have lived on the street their whole lives and know each paving stone inside out. At the end of the day, it still remains just tarmac and buildings.
The point I'm getting at, rather longwindedly, is that it's ok to feel like crap because no one else will see or feel things the same way you have or do. It doesn't make you whiny, whiny people are those who refuse to aknowledge advice then STILL go on about how terrible x or y is.
If you can pinpoint why it is you're feeling so down, it's possible someone here can relate or offer a way to help you pick yourself up. If it wasn't so late, I'd detail why I currently feel pretty crappy but that's a whole other post and I don't really feel like writing an essay right now haha. Chin up dude.