smack your daughter the same way and ask her how it feels.
Back on topic; the reason why i and my wife have been getting a long well enough for 12 years is because we re the same age, same social class, same level of self esteem, both growing up at the same pace and taking care of not letting the other lag behind, etc A relationship is a complex mix of strenghts and weaknesses that cancel/improve each others to create a balance that allow both to survive facing the competition of others couples, families.
The less differences, the higher the odds you ll stay together. That's my opinion. I also strongly suggest man has to dominate in sex most of the time and make it clear no sex = violent breakup.
More likely you just had an unplanned pregnancy early in life, with your wife, and there's nowhere to run from that (unless you'd be very irresponsible). Everything else is more or less good (in terms of compatibility) so it's a bearable experience (not like to many people who did not manage to make a decent choice/circumstances weren't in favor). And you don't know how to earn good money so there are not many chances to get very "wild" in that sense.. It sums up in a succesfull partnership, probably not very exciting, but still better than being a poor chap with nowhere to go after a boring manual job (wife would be doomed alone with a kid anyway, so she's content with a man at home who's staying faithful to her).
Most of the time when people get married very young, there's one thing enough to destroy it later on - money. Man suddenly realises he can have a lot more and probably better (grass is sometimes actually greener on the other side). Or if a female is not working any kind of a job, after years of being a "house wife" and spending husbands money, various evil thoughts arise (idle mind is a devils playground, as the saying goes).
Basically - these who have plenty of options (good looks , good upbringing and rich) - should treat the choice very carefully, as the temptations may get the better of them, when the "boring" phase sets in. These perfect families in the pics rarely do last "forever", but it's a nice phase to be in if it happens, I'm sure.
