The question is whether you really want to spend the years 15 to 35 giving up everything and additionally sitting at home most weekends, so that you can maybe buy a really great home in a nice location at 36. What I definitely know is that back then, with such a mindset, I would have been laughed at among my friends.
In my twenties (2003 - 2012), I most likely left the equivalent value of a small car in Kassel’s bars, pubs, and nightclubs. In hindsight, it would definitely have been smarter not to go out every weekend, but back then no one could foresee that real estate prices would develop like they have since 2011.
However, I would like to see that separately now. Back then, you chose the Kassel bar version (which was frugal compared to me), and that was fine for you, and you should be happy about the experiences.
Whether someone else must have therefore had a boring life, sat at home on weekends, gave up "everything" from their perspective (for you mostly bars), and had to be laughed at is a completely different matter.
Maybe he liked fishing, had and still has a good relationship, enjoyed nature, did sports, made campfires, sat with friends (not in expensive bars), liked tinkering, etc., and thus enjoyed the life he freely chose in his own way (without spending much money).
You present it as if a beautiful life between 15-35 could only take place in a way similar to how you decided for yourself; but that depends solely on your life philosophy and your friends if they laughed at you for a different life or for insufficient self-confidence at that age, if the laughter of others matters to you and you then live accordingly and hang out in bars.
It would be just the same if someone else now would be upset in hindsight that cocktail prices in bars were so high and he had no money for it due to his private situation.
That was HIS life, and he could make the best of it, and you did it differently in your life; that is exactly our freedom; it always has two sides. If real estate prices had stayed the same (as you probably assumed or simply did not consider at that age—I didn’t either), you would be on the winning side today; bars galore and still own a home or nice equity.
Now it is different, and you could simply be happy about your voluntarily chosen time from 15-35, just like the other person with his "boring life" for you. You are now deriving strength from the fact that things did not turn out as you would like, without having given up between 15-35; I find that almost presumptuous.
I know self-employed people who never wanted a boss and loved freedom and lived 100%, which I absolutely find great and partly have lived myself. When the well-behaved employee/civil servant then had the better provision in old age, the self-employed started complaining. The employee/civil servant had to endure that stupid boss all his life, which the self-employed gladly laughed at. Now the consequence for both lives comes, and one starts whining. He would like—very often—to have BOTH or EVERYTHING. Sorry, but I cannot perceive that as responsible thinking.
Where did you take the quasi-right that real estate prices have to remain such that they fit your life plan, i.e., to build a house without equity?
In my younger years, I probably spent a fancy S-Class and more... and would have liked to have that money again when it came to house building and rising prices. But I lived my young life as I wanted and did not let anyone tell me otherwise. Great. BUT... I always knew, and it is still like this, that I must bear the consequence, and I do so—WITHOUT complaining.
Peers had paid off their house by 40, but I still had 250,000 in debt. But I never complained about that (though I was often envious), because my life was voluntarily chosen by me.
That is MY responsibility and not that of rising prices, weekend home sitters, or years!
It is the life you have; I never understand why people make such comparisons with things they would never have wanted to live.
You lived like that, which I find right if it was YOUR wish, and now there are just a few consequences; that’s how life is.