About me

My name is Sarah, I'm 16 years old and I'm from Algeria. (Commas are very easy to over use, often it is good to use "and" for the last member of a list)

I love animals, especially cats. I'd love to adopt one but my mom doesn't want to. :/
I'm a hard working student. Last month I aced my exam; my mom and dad were proud of me. (semi colons aren't commonly used, but this would be the correct usage =D)

I'm pretty sensitive and I cry quickly, I tend to find the good in the bad and I always try to look on the bright side.  ("..." are used when you leave something out or you drift off "I thought he was... wait, where was I?")

I speak French and Arabic well enough, I'm here to improve my English. ("well" would be enough but in colloquial usage well enough is correct)

Thank you for reading.

Very good work =D Try using commas a little less and you'll be sounding natural in no time!

About me

My name is Sarah, and I'm 16 years old,. I'm from Algeria. (don't forget to use fullstop, not only comma.)
I love animals, (Especially cats) and (instead of comma use and) I'd love to adopt one but my mom doesn't want? (better say: doesn't let me or doesn't allow me to) :/
I'm a hard working student. Last month I aced my exam, my mom and dad were proud of me. ...
I'm pretty sensitive and I cry quickly,. (Better finish the sentence here and continue with a new sentence) I tend to find the good in the bad... and I always try to look on the bright side.
I speak French and Arabic well enough (just well is enough), but I'm here to amprove improve my English. ...
Thank you for reading

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Aside from troubles with ... and too much , your English is good. Good luck!