Which type of housing suits me? Probably not a house...

People, the solution will jump at you and bite you right away:

& will either become gay and a couple or move in together and turn the bars of Berlin into their stage to pick up girls.

And how exactly am I supposed to do that? Recently, my mother said to me in a very serious tone: "Something is bothering me. I happened to see you leave the house yesterday at 10 p.m. Should I be worried? I couldn't sleep all night." The fact was that I had forgotten dinner because of too much work and then walked to the kebab shop.

Uh, and you seriously ask why no woman shows interest in you? From a certain age on, probably (almost - never say never) every mentally healthy woman would want to run away from such a parent-child relationship. As many others have already written - your last problem is your house - your main problem is - as far as can be judged from posts - your relationship with your parents, your lack of flexibility (how is an outsider supposed to even remotely fit into the family construct of your parents and you?), your lack of self-confidence and your frustration. "The" women are not to blame for that. The only one who can change the situation is you and only you.

Therefore, I just want to mention that I don’t know that person.
However, I must admit that his problem definitely seems familiar to me. Until a few years ago, my situation was very similar.

If you really are three different people, you could meet up, for example in Berlin.
Maybe you could figure it out together, especially if the situation one complains about is already in the past tense for another (I don’t quite remember the third one’s situation anymore).

And when shopping, at the hairdresser, etc. I only see older people...

Unconsciously, everyone probably has their own rhythm of when they go shopping. When I go alone, I see fewer couples than when I go shopping with my sweetheart. When my grandma was old, I went shopping with her and saw many old people. Meanwhile, my grandma is dead – if I went shopping with her today, I’d probably see dead people. You get what I mean, like the initial suspicion of a causal connection?

If I had come across unsuitable matches on some partnership channel, I would have unsubscribed instead of trying out even more unsuitable candidates from the same source.

And when it comes to real estate, the three most important criteria are known to be location, location, location. In this case: location “right next to mommy” (“mommy” = “the beloved’s mother-in-law”). Ouch. That’s rough, as you can see, right (?)

I can’t sell my house because it stands on my parents’ property. If I am correctly informed, it formally even belongs to my parents, although I paid for it.

Brilliant. When your parents pass away, your tax exemption will completely go toward something you paid for yourself. A real knee-slapper, if it weren’t so bitter.

On the topic of boats: Before building the house, we looked at a few boats - including hybrid boats from Greenline. The house became a bit more expensive and we don't like unsecured loans, so we gave up on the boat. I still think those things are great and they are good for more than just lying at the quay. Just google greenline dot si. Only as a means to a successful search for a partner is that of course a rather convoluted detour. But when it comes to throwing something overboard in the truest sense of the word, it seems like a good idea to me. In the end, you always take yourself along when you go somewhere else. Sometimes it's not easy to distinguish where "baggage" ends and "person" begins. Often backpacks seem to be grafted on.

And how exactly am I supposed to do that? The other day my mother said to me with a very serious tone: "Something is bothering me. I happened to see you leave the house at 10 PM yesterday. Should I be worried? I couldn’t sleep all night."

The fact was that I forgot dinner because of all the work and then went to the kebab shop.

I can relate to that very well; it was no different for me when I was 14 or 15...

Even if it sounds harsh, the problem is simply you. You should consider whether you want to please your mom until her last day and live a lonely and seemingly unhappy life, or if you want to start living your own life now in your mid-40s.

People who diagnose relationship dynamics from a distance are sometimes intrusive. We can at best speculate on how the system actually works – but certainly not judge it.

:
What this clearly shows, however, is that a relationship system also affects third parties (and not only visitors on site, but even those briefly addressed online) and there it partly generates very vivid ideas.
Controlling these ideas or becoming aware of their effect and recognizing and using key levers is very likely a key on the path to a partnership.

In my family environment, there are a number of constellations that strongly reminded me of your explanations.