My Iphone 4 is acting weird? - 1

My Iphone 4 is acting weird, whenever i try to type my passcode, it automatically deleted the number after I type it and it takes forever to get it unlocked. Also, when I text and press a letter, it will randomly press 10 other letters and when i scroll up or down something its all shaky up and down. The screen isn't damaged or anything. Help?

Added (1). Edit: I've also restarted my phone several times

Let me guess, you only use one of your thumb while touching your phone?
If I'm right then there's nothing wrong with the screen, the shaft of your thumb just keeps touching the screen. You'll eventually master the art of thumb navigating!

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