What's wrong with my screen?

I've had my iPhone 5c since January 30th 2015 as a birthday present, it was brand new (never used). About 2 months ago I was FREAKING out because my phone screen came off a little bit. I was crying because I thought it was broken and this is the last phone in getting for a while because I've gone through 6 in the past couple years. Anyways, now whenever I tap on the screen it clicks, it's really odd. I've never dropped it bad but I have dropped it about 3-4 times on softer surfaces. But what's causing this?

Iphone 5 c is not really strong i'm surprised it didn't crack already because you dropped it, it may be factory mistake you can change it for another one

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