First notebook entry: Introducing myself

My name is Summjer.I'm come , from Changzhou.And I'm , a university student in Nanjing. I'm 22 years old and my English is not good. Why is my English so bad? I think it is because I was never interested it. Now I want to begin to learn English again. This is my first composition. There must be many faults mistakes in it my composition.Thank you for reading and correcting it.

You need to write more and be corrected more to compare and learn.  This is the best way other than living in an English speaking country.