Hello,
I don’t think anyone wants to lecture you, and it’s okay if you know where the money went. However, it is a debt trap if you don’t even have 10k left from your income for a great vacation. Academics or not. You can easily afford it, no question. A banker and his scoring machine will only enter/evaluate what is presented. A very good income with zero equity but loan debts and probably a bunch of 0% financing deals that lower the Schufa score.
With all due respect, going on vacation and then realizing you want a house does not show maturity either. Everything is different on vacation, you probably had a caretaker, a cleaner, maybe a cook there. Nobody here in Germany will accept that, even with 5k you don’t have your own employees.
I’m personally also an academic and treated my wife and myself to an awesome vacation and a great wedding, easily costing 30k. We also always had 2 amazing vacations. However, all from equity. When we started on a new build, we at least had equity for incidental costs and the kitchen, no debt. What will you do about interest during the construction period, etc.?
Sorry, but I get the impression that a house and financing are not for you. Surely you will find a bank, but whether you can then live frugally, I don’t know...