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 5s not turning on at all?

My iPhone 5s was at first dead, i plugged it in, the iPhone logo came up but then it died again. It was on a loop for a while. Then i restarted it and now it won't turn on at all! IIm so scared now because i recently cracked the screen. A few months ago, the same thing happened that it wouldn t turn on! I know that IIm bad with phone but how do i tell my dad? He will yell and scream and make me cry.

Is it worth spending 600 dollars on an iPhone?

I already own a galaxy s6 but I miss the simplicity of the iPhone. Also many apps i want are only on the iPhone. I was looking into a six plus and it costs 600 dollars unlocked. Is it worth spending that much money?

How long would it take me to get somewhere on a bike that in a car takes 14 min?

I can't drive yet and walking would take too long. The place I want to ride to is basically flat road really minor hills and just a little bit rocky. The speed limit is 45 miles per hour and sometimes less. I hope that I have enough information. Thanks. (According to the iPhone, it takes 1 hour and 35 min to walk there, not sure if that helps at all)