表达方式有很多,直译是:
I'm majoring in English at XX University.
其他相似的方式有:
I'm studying at XX university and my major is English.
I'm studying at XX University, with English as my major.
I'm a student of XX University and my major is English.
I am a student in XX University who is study English undergraduate course.
I am an undergraduate student in English major of XX University.
I am now doing an English bachelor degree in XX University.