I understand how you feel. It's difficult to feel bad about something you think is petty. However, "Pain isn't a competition. Just because someone, somewhere, may have had worse in their life doesn't excuse or erase your pain."
You may not be a starving, persecuted Christian in a third world country, but that doesn't mean you don't know real pain. Unless, however, you know it's selfish, but that really depends on what it is and how it relates to you/others.