First notebook entry: Introducing myself

Poor English makes me unhappy,. In the 21th century, English is vital important (vital and important are synanymous, so you should pick only one) language, so i told myself to practice and execise my english more to adapt new world (better to eliminate the NEW WORLD since English is used at the beginning of time, not only in new world. As you have mentioned, it is already vital or important since 21st century. You can change it to other phrase, say to cope up with other people or to communicate well)

You can state it this way:

Poor English makes me unhappy. English is a vital language since 21st century. I decided to practice and exercise my English skills to communicate well across the globe.  

Hope this can help you. :) 

First notebook entry: Introducing myself

i'm a native chinese boy, i want to improve my english to face new competitions.and i enjoy making friends , know others culture better.i appreciate all.