Originally Posted by gigi
hi!! i`m very nervous because i can`t write very well in your language. <<
There are no mistakes in that sentence. Congratulations! However, you do need to capitalize 'I' and "Hi".
i`m 22 year old and i will like know. <<
correction: I'm 22 years old. I would like to know how to write better in English.
Practice. Ask people to correct you. That's one way. If you read, it should help. Find some appropriate reading material for your level. Find something you are interested in to read.