How to delete and reinstall my messages app?

Okay, so I sent this really long text message as a joke. And now it won't let me open my messages app. I still receive texts, but when I click on them it just closes the app. It's the basic messaging app that comes with the phone. And I have an iPhone by the way. I've shut it off, and then also rebooted it with holding the power and home button. It still doesn't work. I was told to delete and reinstall it, but when you press an app and the little 'x' appears on the corner, you can't delete the messaging one? I don't know what to do. Help please! Thank you.

Added (1). I don't know how to sync it.

You can't delete the messaging app. If shutting it off doesn't work. I would sync it and then restore it, that will definitely work.

How do I delete and reinstall my apple message app

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