and bam.. already disqualified Sounds like the typical naive & young adolescent.
Get a bit older.. gain some life experience.. reflect on yourself.. then think about a house
I find that sounds very condescending - also not very qualified and furthermore not directly helpful.
I actually have no idea about finances and house construction/purchase, I can only advise you from my personal perspective what I would do:
Sign a good building savings contract now to secure the great interest rates and then pay into it. And that with at least the amount you would have to pay monthly for a house plus what would go towards parental leave or daycare costs. So that you have that amount of money left over which you would actually have available, for example, during parental leave with child no. 2. Also consider that you pay daycare costs for child 1 (here 400-500 euros per child and you also have to outfit and provide for two children )
And then, if possible, stick to it for about 2 years.
That would be my plan, because many costs do not occur monthly or yearly, e.g. major car repairs... Then you would have 1. secured the interest rate, 2. a bit more equity and 3. a realistic assessment of how life is with the money.