I was surprised
No me sorprendí por la pregunta.
I wasn't surprised by the question.
El otro día vi a Gi y me sorprendí.
The other day I saw Gi and was surprised.
— Hoy Quiero Volver Solito (2014)
Me sorprendí cuando dijeron que iban a casarse.
I was surprised when they said they were going to get married.
Yo me sorprendí cuando Tom me explicó por qué razón él necesitaba hacer eso.
I was surprised when Tom explained to me why he needed to do that.
Hasta yo me sorprendí de lo bien que salió todo al final.
Even I was surprised at how well everything turned out in the end.
I was truly surprised.
I surprised myself.
Let's just say I wasn't surprised.