I hate when people do that. Every problem is important and horrible in it's own way. You cannot compare the severity of personal problems, because they are personal. Some people are stronger than others, certain things affect different people.
If you're upset and some one puts your problem in 'perspective', don't bother talking to them about it again because they don't understand.
I know the feeling, it's ridiculous, though. When you have things to worry about, don't think about third world countries. They can worry about themselves. That's a bit harsh, I know. But it's true. It may be selfish, but when you worry about your life first, things tend to go better.
By the way, you're extremely pretty(not to sound like a creeper or anything, sorry).