Do you think people that decide not to have Children or selfish?

We live in a society that teaches you got to school, get married before you are 30, get that house with the white picket fence, spouse, and 2 kids. Whenever you hear someone admit that they want to put there career before first or themselves first and don't want children people act like they understand and its cool, but there awkward look says otherwise...lol...Do you think these people are selfish and should sacrifice to bring a new generation into the world?