Iphone 5s defect or something?

I just got an iphone 5s from bestbuy yesterday and i've noticed that there's a gap at the top and i believe leads down to the left side and when i look at the phone when i'm holding it flat at the bottom (don't know how to explain) but some of the plastic piece looks like its popping out a bit. Its a white and silver 5s and will alot of dirt and stuff get in there? And my dad probably wouldnt want to take me to an apple store and stuff and deal with this and stuff.

Sorry, but you need Apple to take a look at that phone. I'm sure your father would dislike a faulty expensive phone more than a trip go the Apple store.