Why don't you just do what makes your life more comfortable? Then you won't have to answer any questions at all. Pretend you don't have a child. Shouldn't be hard except when you have to write that check. But 29-30 days of the month you can be footloose and fancy free. Allow your ex to change the boy's name so he can move on with his life with a Dad who loves him and cares for him. Even better, allow the adoption - you'll save $800 a month - and the boy will have a Dad who cares deeply for him. Once the adoption's through, change your name, create a new persona, and you'll never have to answer those hard questions. 'Cause, it's just not right that you should have to face the mistakes you've made. It isn't faaaaiiiiiir.
And for the record - this has absolutely nothing to do with being the mother or father, male or female. It has everything to do with recognizing a pathetic little whining loser.