In reading all the posts I see one thing in common behind the complaints; Jealousy!
Jealousy is something that creeps up in a marriage, when raising kids etc. You have a young guy, he sees his friend got married and seems to be having a blast. He went on a honeymoon, is getting supported by parents in-laws, has a nice apartment, car, clothes, a pretty wife who cooks for him, cleans up after him etc. He is jealous and wants to get married, he doesn't necessarily realize that is why he wants it. He thinks he is ready to commit to being a spouse and in the near future a father.
He wakes up after 7 Berachos and realizes that its not all fun and games. There is work for him to do as well. His wife may have a job ad be unable to go on a long honeymoon, his parents/in-laws may be unable to help him financially. His apartment may not be as nice, or car as new and fancy. His wife may be too tired after a full days work to cook lavish meals and keep a spotless house. He then hears about all the vacations others are going on, and gets more jealous. This leads to extreme unhappiness. They then realize that they are expecting a child. If they are unhappy in their own lives, there is no way for them to be happy as parents.
Instead of looking at what others have or don't have. Look at yourselves and try and be happy with your lot. I think this rings rue for married people, single people, parents, and people who haven't yet been blessed with children. Its not always easy, but it is very liberating. Don't do things because of what others do, or will say and think. Getting married, having children is a choice (albeit a Mitzva as well) someone who hasn't had children or gotten married is in no ways a lesser Jew or person then others who have.
Be the best that YOU can be. Be as happy as YOU can in your situation. Make the choices that are right for YOU. Learn how to be happy for someone else without instantly wanting that for yourself.
If you have trouble or negative feelings, talk to someone. Your spouse, parent, friend, Rebbe, Rav, teacher, therapist, barber, shaitel macher etc. Just talking makes you feel better. I don't think an online forum is the right place to discuss such sensitive and prevalent matters.