Maybe they think the only reason you exist is to give them what they want. Maybe they really do think the only way for their child to be happy is to have children. The reasons for this can differ from parent to parent. See, your parents know that the only way you'll truly make them proud is to pop out a few kids of your own, allowing them to live their dream of being grandparents.
When you look in the mirror, you see a confident, sassy young woman (usually) with a great career, and everything to be proud of.