Your entry was very confusing in some places, but here are the corrections to what I think you were trying to say: 

About myself

Hello, my name is Ya-chih Cheng, and I come from friend Taiwan. I'm 32 years old, so I'm no longer a young girl.

I am not completely sure what you are trying to say here -> My major is nursing, and I have five more years of college, I have been a nurse in hospitals for 7 years.

I have no idea what you are trying to say here ->,as every one knows shift stuff is sooo tired,so I require my nurse job last June 30th. 

I am now back in school studying nephrology in Kaohsiung Medical University.
Eventually I wish to be a hemodialysis nurse.

In my spare time, I like hang out with my friends to watch movies, go shopping, eat, and chat. Sometimes I love to be quite and stay with my cat. I am really interested in English, so I joined italki. I hope I can improve my level and meet some friends.

About myself

Hello,my name is Ya-chih Cheng,come from Taiwan.I'm 32 years old,not a young girl,hehe...
My msjor is nurse,after five years college,I been a nurse in hospitals for 7 years,as every one knows shift stuff is sooo tired,so I require my nurse job last June 30th.And,I back to school,study nephro in Kaohsiung Medical University.
Wish I can be a hemodialysis nurse one day☺.
In my spare time,I like hang out with my friend to see a movie,
shopping,eating,and chat.Sometimes I love be quite and stay with my cat.I really interesting in English,so I join italki,hope I can improve my level and can to meet some friends.