Because the condominiums are getting more and more expensive

You don't want/can't do any handiwork yourself, but you don't really want to live in a multi-family house. Condominiums in buildings with few units are not available in the area where you want to live. From this, you conclude that you have to build yourself - but why don't you just take an existing house? You always have to renovate (or have it renovated) a little, but at least you have a foundation.

In principle, you can also rent; you don't always have to buy right away. Choose a place you like and rent a house. If you live there for a few years and still like the place, by then you'll also know people and will find out if a house nearby is going to be offered for sale. Then you can save yourself the exorbitant realtor fees, have no doubts about the location (because you already know it well), and by then you might also know how many people to expect in the end. At the moment you are alone, but that might not stay that way forever...

@everybody: First of all, thank you very much for the helpful advice and ideas. I will now save diligently for 2-3 years and see what opportunities arise. Until then, I definitely want to familiarize myself with the topic and then decide whether I really have to build myself or if a used house would also do, as long as the price is right in the end.