Am I fat...tips on how to not feel fat?

I'm 5'5 and 115 I'm a seventeen year old girl by the way. What can I do to not feel fat??? There is a major dance coming up and I don't want to feel like a porker in my dress. I'm on swim team so normally I exercise at least 2 hours a day, but I have bronchitis so I can't swim for a week. Any exercise ideas that are easy on the lungs? Thanks