Brief Self-introduction

I'm presently living in a seaside city in the south of China.As English is a Linga Franca,I decided to try my utmost to grasp it.I believe English would help me to know the world better as well as the knowledges in various fields.And I'd like to share with friends here my culture,traditional customs,trivial happyness and also frustrations in my life.

This is Fine, Nat. We would write the title with initial capitals to give it more prominence than the actual text. Lingua and happiness I think were typos. The major issue is with not leaving a gap after a comma and a full stop, so, please leave a space as I have done here (after the comma and full stop in this sentence).  haha. If writing, I may try to write as follows:  

I currently live in the South of China, within a coastal city. The fact English is increasingly viewed as a lingua franca, provided me with the initial stimulus to learn this language to the best of my ability. Enhancing my English skills will, I believe, enable me to better understand the world in which we live and unlock the key to a wealth of knowledge across countless fields of study. And I'd like to share with friends here my culture, traditional customs, trivial happiness and also frustrations in my life.

brief self-introduction

I'm presently living in a seaside city in the south of China .As English is a Linga Franca,I have decided to try my utmost* to grasp it.I believe English would will help me to know the world better as well as the knowledges in various fields.And I'd like to share with friends here my culture,traditional customs,trivial happyness happiness and also frustrations in my life.

Less modified than Ken's version.

*utmost sounds very formal to me. I would use 'do my best'.

brief self-introduction

I'm presently living in a seaside city in the south of China.As English is a Linga Franca,I decided to try my utmost to grasp it.I believe English would help me to know the world better as well as the knowledges in various fields.And I'd like to share with friends here my culture,traditional customs,trivial happyness and also frustrations in my life.

I'm presently living in a coastal city, which is located in the south of China. Being a lingua franca, I decide to do my utmost to grasp English. I firmly believe that English can provide me with a better understanding of the world as well as enrich my knowledge toward different fields. Also I'd like to share my own culture and traditional customs, our moments of happiness and sorrow through lives' stories and experiences with people from everywhere.