My iPhone screen is glitchy?

I've dropped my iPhone 4 a couple times before but just external damage. I don't know if this time is worse because now it's really hard to scroll vertically. I have to make small quick swipes or else it reads it as a tap instead of a scroll. I also can't tap on things like a bar to type in messages on things like Kik. Does anyone know what to do? Help Please

Added (1). I also can't tap on anything that's at the bottom of the screen like a bar to type in messages

You have probably damaged it severely but take it in to an Apple store or to your service providers store and have them look at it.

If it is glitchy, then turn your phone off and on again.Unfortunately, it could never work but try your best

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