YOU SAID:
I'm sitting in class, very bored
INTO JAPANESE
私は授業に座っていて、とても退屈している
BACK INTO ENGLISH
I sit in class and am very bored
INTO JAPANESE
私は授業中に座っていて、とても退屈している
BACK INTO ENGLISH
I sit in class and am very bored
That didn't even make that much sense in English.