social security tax

What is the name of your state? missouri

i am not an american citizen, just permanent resident - i have a green card only. i am not going to become an american citizen, because i don't want to lose my native ctizenship.
i have had 3 jobs so far. first was just an internship before i got married and applied for the green card. the next 2 were regular jobs after i got my work permit. for the 3 years i have been in the usa and worked at these 3 different jobs, a certain amount of money was deducted out of my paycheck as a "social security tax". since i am not going to become an american citizen, am i going to be able to get my "social security" tax that i paid back and do i need to be paying it at all?(currently it is still being taken out of my paycheck every 2 weeks.)
thank you for your time and help. i really appreciate it.

[Snipes5]

If you have a green card, and are considered to be a permanent resident, whether you choose to become a citizen or not is immaterial.

As a green card holder, you are required to pay into both SS and Medicare. There is a good side though, because you'll be eligible to receive benefits from it when you reach the appropriate age, or if you're disabled, even if you never become a citizen.

Snipes

[abezon]

For more info, check out "totalization agreements" at the ssa.gov website.