Today is my first time in this place.  I would like to meet people and be friends with one another.  Let me introduce myself:  I am a college student studying in Sanya College.  My hometown is Zhejiang, China.  I have a sunny disposition as I smile a lot.  ... That's the reason I smile all the time.  I like English and I want to learn it well. can you help me ?

First notebook entry: Introducing myself

Today is my first coming to this place. So I want to know each other and make friends with you.Now,please let me introducing myself.
I am a college student of sanya college CHINA. I am come from ZHEJIANG province.I am sunny as well as I like smile. I think the word must leave away with sadness1. That's the reason why2 I always smile.
I like English and I want to learn it well. can you help me ?

1.  I cannot decipher what you are trying to say.  Write in Chinese so that people who can understand Chinese can help you.

2.  You cannot use "why" after "reason".  It is redundant.  A very common English mistake.