My boyfriend and I have been dating for about a year and thinking about marriage. We both are in love but I'm also a illegal alien. I heard from a friend that if I get married at 19 I'll have to wait till 21 to fill out for citizenship, is that true?

To be eligible to sponsor green card for alien spouse, US citizen must be 21 years of age with income of 125% of poverty guidelines, and have record of paying income taxes for the past 3 years.