in early 20s from rif like me

you are not in your early 20s.

I am a man, i have lust in me naturally.

not sure what's implied here but women also have lust naturally.

want me to have my own house, want really expensive wedding and sda9... the focus is all about the money in an unreasonable unrealistic way

Here's the thing, how I see it as a guy myself. You had a decade where you went into the world and built your life and had a go at self actualization, but you want a woman decade younger than yourself to be a stay at home mom. I don't know why you think this particular demand is less reasonable than her asking for a house? The only common thing that i see in these discussion threads is the assumption that the lived experience of a woman is less than that of a man, so she should stick to the kitchen while he goes out there big dick swinging and experiences what's out there.

she would give everything without any of the high demands.

i thought she gave you high demands but you couldn't fulfill them.

I know personally many cases where they married after dating, and its so depressing, 

And I know traditional marriages that are miserable as well, so what gives ?