Lol..True..
If your father is poor it's not your fault, but if your father-in-law is poor then it is definitely your fault

So I would rather find a millionaire girl and would get happily married and happily rich

Well yeah that's the point, there are many choices to choose how to get rich
here is a great quote: If you are born poor its not your mistake, But if you die poor its your mistake.
Maybe this will inspire you.
Studying and doing a normal job is never going to make you rich, thats a fact, you can get better position in your company but as long as the boss is not your father or someone from your family you would, most likely, never get ascended to boss which is the one who really is making money.