Why isn't my iMessage working?

I have an iphone 4 and today all of a sudden my phone started sending text messages instead of iMessages but in my settings it says that my iMessage is turned on so I don't know what to do!

Added (1). No the people I'm texting have iphones i'm not that dumb haha but it's not working with everyone

It's more than likely caused by either:
A) the person you're texting has no iPhone
B) the person you're texting has their iMessage turned off
C) simply something wrong with your Internet connection

Calm down. They probably don't have an iPhone, or their iMessage is turned off.

Turn off iMessage and back on again. You need credit with your service provider to activate.

Either they have iMessage turned off, something's wrong with your/their internet or iMessage is down

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