你好 我 叫 Cecily。我是 英文 老师。我是 美国人。我来自 旧金山湾区。

谢谢

Your note is correct. Please notice the period. '。' and '.' are different.

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As for your question, Cecily is a beautiful English name. You may simply translate it into 塞西莉[sāi xī lì], but that's just a transliteration. If you can tell us your full name and the meaning of your name in English, we can do a better translating job conveying the meaning of your name while imitating the pronunciation of ' Cecily'. 

Hi Cecily, 

For your question:

"if Chinese people adopt English names, could I get a Chinese name? How would I choose it? "

Unlike English names that usually coming from Bible or other historical origins, Chinese names can be created through combining some characters, as long as the characters you choose have good meanings. Yes, Chinese names always convey some meanings or expectations from older generations. 

So my suggestion would be choose 2 characters that have good meanings, beautiful pronunciations,  and your personal preferences. and don't forget to ask advices from your Chinese friends before you make your final decision. 

introduction (介绍)

你好，我叫Cecily。我是英语老师。 我是美国人. 我来自美国旧金山湾区。

I hate to correct student's writing too much but this way put two sentences into one do sounds better and more like local Chinese.

Question: if Chinese people adopt English names, could I get a Chinese name? How would I choose it?

谢谢
Xièxiè

I agree with Charlies and Zoey's ideas about your name. Another suggest I would like to give to you is that ask your Chinese friend who knows you and propose you Chinese name with better meaning.  Like, a student of mine is called 风雅 which means "Elegant Wind", her English name is Clare and yet her personality is very much like the name. ))