Difference between 这里 and 这儿 or 哪里 and 那儿！
I always make confusion with 这里，这儿，哪里，哪儿。Is there anybody who could tell me the difference ? :)

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這裡 and 這兒 = This place， 有"這個地方"的意思
哪裡 and 哪兒 = where is it ? ex ： 這是哪裡? 哪個地方?
那裡 = That place ，會指比較遠的地方(You use this word when you describe a place but far from where you stay right now.) ex : 人在高雄，卻說：台北那裡有很多美食
(You live in Kaohsiung, but you just say there is a lot delicious food in Taipei. )
以上是台灣用法 all of above is Taiwanese type 
By the way , 在台灣沒有人會用"這兒"跟"哪兒" (In Taiwan, no one use "這兒"and "哪兒" ,we say "這裡" and "那裡")
 
这儿 and 哪儿  is from Mainland China

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Northern Chinese people usually say "哪儿，这儿"
Southern Chinese people often say "哪里，这里"

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They have the same meanings but those ending wit 里 are more often used. Those ending with 儿 are considered informal.

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In English, "make confusion" would mean cause confusion for others. Although this could definitely happen when speaking Chinese, I think you mean that *you* are confused. In that case, it would be better to say:
"I always get 这里 and 这儿 confused."
"I always get 这里 and 这儿 mixed up."
or: "I'm confused about the difference between 这里 and 这儿."
or: "I'm not sure about the difference between 这里 and 这儿."

Anyway, thanks for asking this question. I was wondering the same thing, and the answers below really helped me!

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这里，这儿they have the same meanings,but 这儿is more used in spoken Chinese.
那里，那儿means there.
哪里，哪儿means where.