This is the 4113th most frequent Spanish word.
féliz
The correct spelling is "feliz," and it means "happy" in English.
Here, 'feliz' is used as an adjective to describe the emotion of the subject 'Me'.
Me siento feliz cuando estoy con mi familia.
I feel happy when I am with my family.
In this sentence, 'feliz' is used to describe the girl's mood after an event, modifying the state of 'estar'.
La niña parece estar feliz después de recibir su regalo.
The girl seems to be happy after receiving her gift.
Here, 'feliz' functions as an attributive adjective describing the type of life being referred to.