Hello, my name is Sunny. I'm a college student. I can speak chinese well,and i want to learn English.

Chinese

as a rule of the English language, every proper noun or adjective which indicates a language or a nationality must have the first letter capitalized, for example:

the English language

my (level of) English

in English

the Chinese language

my (level of) Chinese

in Chinese

I

by convention, the first-person singular pronoun has always been written capitalized.

One last thing:

I think the comma right before "and" is an error. Is not important but I know it's common among Chinese speakers.

Is it because in Chinese it would be like this? "我说汉语说得很好，还要学会英语"

You did great for a short notebook entry, well done!

First notebook entry: Introducing myself

Hello, my name is Sunny. I'm a college student. I can speak Chinese well,and I want to learn English.

You have made a good start, remember to use Capital letters fo language and country names  and for the single letter I.