을 느끼고

feel … and

→ 을
phrase Common #4,666
feel … and 을 marks the thing being felt, and 느끼고 connects to what follows. With 있다, as in 느끼고 있어요, it means “am feeling.”
KO: 나는 두려움을 느끼고 있어요.
EN: I am feeling fear.

나는 큰 죄책감을 느끼고 있어.

I feel very guilty.