My phone is stuck on "downloading do not turn off target."

Since morning I've been having a problem with my phone, it kept saying "unfortunately YouTube has stopped" etc... all my apps kept stopping. So i switched off my phone, even removed the battery. It would come on but then freeze. So i turned off my phone again, removed the battery... etc i tried a lot of things. Then it stayed on the screen logo. wouldn't even come on. I just tried the volume button, home button and power button. Now it's on "downloading do not turn off target." ugh this is annoying -_- i just want my phone back on.

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