Phone Screen keeps pressing on certain spot?

So about a year ago, my phone was dropped on cement, landing on its back and shattering the screen. Since I was (and still am) a cheapskate, I decided to replace the screen with an iPhone 5s screen. Everything was good for a while, Touch ID still worked, color was great, but eventually, things started to get weird. My keyboard would press on certain keys when I tried to press on others. Random videos would be pressed while I was on YouTube. I eventually realized that the screen was "pressing on itself." I was using an app and realized that it would keep swiping to one corner for some odd reason.Drawing lines on the right side, kept being dragged to the bottom left corner.

I don't know whether this is a result of the drop or if this is because I used an iPhone 5s screen as a replacement, or some other third cause. This has been a really big inconvenience and has caused me to make unwanted phone calls and send unwanted texts. Please help me ;-;