My iphone 5s screen is going wack?

My iphone 5s screen keeps messing up, it will tap on things I didn't tap, it will scroll the opposite way from what I'm scrolling, it will barely let me type and sometimes I can't swipe on the 'swipe to unlock' I have gone as far as factory reseting the phone and it still is not working but going to the store is not an option for me, what can I do to fix this?

Maybe the screen's wet or dirty, try wiping it with a cloth. If that doesn't work, get it fixed.

Get an Android. You won't regret it.