Leave, I'm 8-years-old and my hand hurts.

离开！我只有8岁，我的手都疼了！

My hand hurts.

我手受伤了。

That said: "My hand hurts, grasping tight friends! ""

那个说：“我的手疼了，抓不紧啦 ！

You still tightly pulling my hand not to put, my hand hurts.

你还紧紧拉着我的手不放，我的手好痛啊。

My right hand is very painful. Or “My right hand hurts(aches).”

我觉得右手很疼。

True: My right hand is very painful. Or "My right hand hurts (aches)."

我觉得右手很疼。

My ear/hand/leg hurts.

我的耳朵／手／腿疼。

I cut my hand and it hurts.

我切着手了，它痛。