How many % to lose greencard if out of the country > 3 years?

Don't Think the Tijuana route is a viable option. I would look further at other options suggested below rather.
 
So, basically, I do not qualify for citizenship?
We can't know if you don't tell us when your stepdad became a citizen, whether he legally adopted you, and when your mother became a citizen. Not just your age when they became citizens, but the year when it happened because the laws have changed over the years.
 
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