Why Get Married Instead of Being in a Relationship?

Lately I've been having a lot of conversations about why there's such insistence specifically on marriage and not just on being in a relationship without marriage. So, without getting too deep into Judaism for a moment, but in a nutshell, according to Judaism, the purpose of our lives is our own personal correction, to work on our animalistic side. So, if we don't understand and accept the idea that we came here to do the work and to improve ourselves, of course we wouldn't want this. That's why marriages also don't last, because we just don't feel like putting in the work. We just want our own peace, our own fun, our own comfort, and whatever feels good and flows for us in a relationship. As long as I'm having fun, no one's bothering me, and no one's demanding too much from me, then cool, I stay. But when it starts to bother me a bit and demand something from me, then I bail and go back to my own fun. So, forgive me if I'm maybe not that cool, but I still insist on marriage and not just a relationship. When people say that marriage is work, what they mean is working on myself, not on the marriage itself. If I still choose and agree to work on myself on the giving and self-effacement that it requires of me, we realize the absurdity that nowadays people on dates and at the beginning of relationships are embarrassed to say they want to get married and build a home, because it makes them seem anxious and desperate. How did the highest and most noble desire in humanity become something to be ashamed of? There are endless boundaries, rules, and commitments in marriage, and in a world where we all continue to sanctify our obsession with freedom and comfort, it's obvious that the idea of marriage won't be so popular.