Just get it over with and tell her your gay, and then you can begin to bargain. Like better curfew hours etc.
heck no that doesn't mean you shouldn't get married. you get married when you fall in love and commit yourself to you lover. marriage is a life-long committment - not an excuse to make babies.
You don't necessarily need to have kids if you get married, many couples decide not to or others aren't able to. ITs a personal choice however, most adults like the idea of grandkids, so that's probably why she said what she said.