It means "if I want". Si is the Spanish word for if. Quiero is the yo form of querer, which means "to want" and yo means "I", so quiero is "I want".
If it was something like sí quiero (notice the accent on the i in sí), it would be something like "yes, I want" since sí is the Spanish word for yes.
"Si te quiero" in English translates to "I love you."
Let's assume it's a question. Then it says, "What happens if I love you?"
"I want to..."
"I want to know."
"Quiero presentarte" in English means "I want to introduce you."
"Si te quiero" in English translates to "I love you."
Translation: I want to know if (you, he, she) will go out with me?
it means "if I want"
Let's assume it's a question. Then it says, "What happens if I love you?"
"I want to..."
Quiero means "I want"
I want
"I want to know."
"Quiero presentarte" in English means "I want to introduce you."
It means, "...because I really do want to see him/her..."
Te quiero comer = I want you to eat.
quiero algun gatito = I want a kitty