Hello Ronny,
great that you are thinking about home ownership.
It's a pity that this seems to be a short-term idea – in other words, as Schneemann and TomTom have already pointed out, you obviously haven't saved anything in the past.
Which new facts have come up that convince you that you can afford financing? The already mentioned roughly €1,000/month for a 100 to 110% financing seems very optimistic to me.
In plain English – take the suggestions to heart: keep a household budget, save, resist taking out further consumer loans for, for example, a new TV, and so on (even zero-percent financing is recorded by [Schufa]).
Nevertheless, I am clearly of the opinion that your dream does NOT have to remain a dream, but not just yet – first try financing on a trial basis.
a) take around €1,300/month as house costs, from which you subtract your rent.
b) save this balance (at least) in the financing plan of a good building society (Wüstenrot, SchwäbischHall)
c) don’t let yourself be talked into an unrealistically high building savings sum, but have it calculated concretely which building savings sum will be eligible for allocation in 5-6 years.
The advantage of this approach? On the one hand, you have created real equity, on the other hand, you have a claim to a low-interest building society loan (make sure not to agree to high repayment rates), and in my opinion the most important thing – YOU know what financing feels like and can then calmly decide whether you want it or not.
Best regards
JoS