IPhone 5s restarting and screen going blue/line-y?

I was just on a social media app when my iPhone restarted itself, then after the apple screen came up, instead of turning on the screen just goes blue and has lines on the bottom half. Please help I've only had this phone for 3 weeks and my parents will be so mad if I've broken it. Thanks in advance.

Added (1). it turned on once, and the screen kept flickering for a while then turned itself off again, and kept repeating the process of apple logo screen, blue grainy screen, over and over again.

I think your device has gone into Restart Loop, the only thing you could do now is to Hard Reset it, you may also install Leo Privacy Guard in case you need a good security app, it's the best one when it comes to security.