First of all, congratulations on the house
There is no right age. If it is your wish and everything fits, then just do it. You always learn from mistakes. In 15 years you might build again because your needs have changed or whatever. You never know in advance, so just do it. I am curious about your floor plan simply because it is nice to see how younger people think.
When I was your age, I also bought a condominium because a house simply wasn't an option for me yet, but everyone has different preferences.
And as someone wrote above, I have the feeling that the pressure today to be "perfect" and everything great, etc., holds many people back. Through the show-off on Insta, where much is edited or faked, unfortunately a false image is created for many. And overall, far fewer people in Germany dare to acquire property when you look abroad. That’s why we have many investors in terms of renting out properties, as it makes sense. Colleagues in Southern Europe and also in the East are noticeably more relaxed about this.
Feel free to post pictures and floor plans here. Even if there is criticism, you can’t please everyone. You might get new ideas, but in the end everything has to please you and you have to feel comfortable.