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"Don't know" is a form of "know", a transitive verb which is often translated as "saber". "My life" is a phrase which is often translated as "mi vida". Learn more about the difference between "my life" and "don't know" below.
my life(
may
 
layf
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. mi vida
The birth of my daughter was the best moment in my life.El nacimiento de mi hija fue el mejor momento de mi vida.
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know(
no
)
A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
transitive verb
a. saber
Do you know when the next bus is leaving?¿Sabes a qué hora sale el próximo autobús?
He knows French, Spanish, and German.Sabe francés, español y alemán.
a. conocer
I know her from school, but we're not really friends.La conozco de la escuela, pero realmente no somos amigos.
a. entender
I don't know how you can treat her like that.No entiendo cómo puedes tratarla así.
a. reconocer
I knew him just by hearing his voice.Lo reconocí tan solo de escuchar su voz.
a. saber
I don't know if you should walk home so late.No sé si deberías caminar sola a tu casa a esta hora.
a. saberse
Do you know the alphabet yet?¿Ya te sabes el abecedario?
He knows a lot about the American Civil War.Se sabe mucho de la guerra civil estadounidense.
An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
intransitive verb
a. saber
Is today Tuesday? - I don't know.¿Hoy es martes? - No lo sé.
a. saber
Did I leave the keys on the table? - I don't know.¿Dejé las llaves sobre la mesa? - No sé.
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