If this case is bent, it will hardly sit properly on your iPhone. I don't think your iPhone will be damaged by wearing it, but I doubt you will get any real protection if you drop your iPhone.
A good tip for when you buy cases again. So pay a little more for it, and buy a case from an established case manufacturer. You will get much better quality and better protection. The MagSafe magnet (if you use this) will often also be much stronger in a proper case. Another good tip - buy cases with microfiber lining inside, so you avoid that dust that gets in will make micro scratches in your iPhone over time
Now you have bought a nice new, and expensive iPhone - isn't it a shame to wrap it in a cheap case?