First notebook entry: Introducing myself

Hello,everyone,I am from China,I like making friends、travelling and doing some sports.
I am a university student.My major is law.As we all know,English is a popular language in the world.I have been learned English for 9 years,but my English is still not very good.So I want to improve it.I hope I can make some friends whose mother tongue is English to help me improve it.Of course I can help you when you need my help.I am glad to help you.

What you wrote is clear and understandable so there is no issue with your being able to commnicate.  What follows is how a native English speaker might introduce him/herself.  I changed the last line a bit because in your introduction, wasn't quite sure what you are trying to help with.

Hello Everyone:  

I am from a university student in China who majors in law.  I enjoy making friends, traveling and participating in sports.  English is a popular language and I have studied it for 9 years.   However, my English needs improvement and hope to make friends with people whose mother tongue is English.  In exchange, I would gladly be willing help you in some way.