My iphone won't let me stream videos on youtube. How do I fix it?

My iphone won't let me watch videos from the internet etc youtube. When I click on the video nothing happens. I thought it was just Safari so I downloaded Opera Mini web browser and tried to watch a different video. When I clicked on the video the screen goes black. I can exit it though by pressing home button but please help me! (By the way, I can surf the web just fine)

Don't use your browser, try the youtube app.

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