Very good so far! Everything you've written seems to be correct, however, a native English speaker (from America anyway) would probably phrase their sentences a bit differently. For example-

"I am a year one college student whose major is English Study. I want to improve my language skills by communicating with native speakers.Thank you!"

would probably be written...

"I am a freshman* in college whose major is English Studies. I want to improve my language skills by speaking* with native speakers. Thank you!"

*1- freshman is a first year student in high school or college
*2- although this is technically correct, a native speaker would use the verb "speaking"

 Very good work though. Keep it up!