My best friend and I me

My best friend is Qingqing. Many people have said we are looks like twins, but we are not sister and sister sisters. We have the same hobbies.  We likes reading, music, learning and drawing. We both have long hair, thin, dark skin [1, 2] and are the same high tall height. But I think she is better looking than me. I'm more outgoing than she is. We love to go shopping and wear the same style of clothes.

We help each other.  She is good [3].  I hope that our friendship lasts forever.

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[1] You have said:

"We both have long hair, thin, dark skin, and are the same height."

Because you have said, "thin, dark skin," this means that your skin is both thin and dark. The following is a better sentence:

"We both have long hair, are thin, with dark skin, and are the same height."

[2] The word 'thin' may be considered impolite when discussing a woman's body. It can suggest the woman is "too thin" and may be unhealthy. A better word is 'slender'.

"We both have long hair, are slender, with dark skin, and are the same height."

[3] This sentence has little meaning.  It would be better to say one of the following:

"She is a good person."

"She is a good friend."