From watching nature with a dispassionate eye, you would tend to get the idea that the meaning and purpose of life is nothing more than reproduction, i.e. making more life. Well, why would it be different for humans, other than the exquisite vanity of our wanting it to be different? Our wanting the universe to be governed by a god who looks like us, for example. Our wanting to be "happy" or "fulfilled" and so on. No, we're basically animals, just mentally a bit more complicated. So I think our lives are pretty much all about reproduction too, but with an overlay of "meaning" that is completely arbitrary. Your life can be about reproduction if you want, or it can be meaningless, or it can be filled with whatever meaning you want to fill it with (i.e. make up from whole cloth, or borrow from the collective). I find this freeing, because it puts me in control, but your mileage may vary.

Anyway, my challenge to everyone here is to try and unify the pre- and post-children mindsets. The stuff you're interested in doing before you have kids might be the same stuff that later interests you about your kids. Take the statement, "Shoot, I have kids, so I can't go out anymore." Well why were you "going out?" Was it "to meet people?" That's kind of just code for "meeting sex partners" and don't tell me this is not at least in the back of your mind, hovering near the threshold of consciousness (if not an explicit goal). And well, you know what sex is for. It's not so you can have a good time; it's what evolution uses to trick you into making more humans.

When you're attracted to someone, you're really just assessing them and deeming them reproductively fit. Those traits might include a fit body indicating health/robustness; a nice face indicating (studies have shown) the person is near the average of the gene pool and therefore carrying tried-and-true genetic material; a personality that indicates a good chance they would behave kindly toward any offspring; and an intellect that shows they could solve any problems that come up.

Working with computers or doing any other challenging mental problem, playing an instrument, having a bunch of money (or things that cost a lot of money), doing feats of daring like base-jumping or whatnot, all of these are ways of displaying your fitness for mating. Before some of them became "occupations" you could earn "money" with, they would've been used for solving problems to protect or feed or clothe (etc.) the village or tribe and its progeny. (Not base-jumping specifically, but challenging oneself with risky feats of daring, and coming out on top, that does prove something about your courage and skill, which would at the very least be useful in hunting or defense.)

School and all childhood learning are preparation for mating, or for learning one of the above preparations for mating, or for "being an adult" which equals mating. Interestingly some of that involves sheltering the child from mating concerns, which is consistent with how we train noobs everywhere. We don't be givin' you the source code for the compiler during the "Write your first hello world" tutorial, for example.

Life is meaningless, or it's about mating, or it's about whatever bullshit you want. Have a nice day!