iPhone 5s touch screen problems

Okay so my iPhone 5s, I purchased about a year ago. I have dropped this phone once onto the ground. but this I don't think has anything to do with this because this happened about 3 months after I got the phone. Now I've had it for over a year & I never had one problem with it. It worked as new. No scratches no nothing. There is still no scratches or cracks in the phone. It looks new. Now my problem is out of no where my phone the touch screen got these 2 weird glitched lines going vertical on my screen. When it first happened I didn't think anything of it because when I would lock my phone it'd go away but now it has been on there for exactly 3 months. My touch screen has been messing up also ever since this glitch showed up. I don't even have to have my hands near my screen and it'll type by itsself. It'll type random letters and sometimes when I'm typing it'll scroll the page or the screen with stop until I lock my screen & unlock it again. Which only fixes the problem for a little while. I really don't know what this is and anything helps please if you know anything please leave a comment or suggestion I've already reset my phone turn off & on nothing has helped. So please if you know anything.