1、On the first day of high school, I am a little nervous, but excited in all.
2、The first day of high school life,I was a little nervous and also excited.
3、On my first day in the senior high school, I was a bit nervous but excited.
4、On the first day of high school, I was a little nervous but excited.
5、On my first day of high school life,I was a little nervous but quite excited all today.