If you are meeting lots of similar women, in this case gold diggers, have you ever thought maybe it's the type of woman you like? Change up your standards and tastes a little bit.
If you are always picking the decked out girl wearing the $500 jeans carrying the $800 handbag you will likely always get girls who care about money.
That said, getting married is just a ceremony. In my opinion it's pretty meaningless these days, why make it a life goal.
I've been with my girl for 8 years now, and we aren't even bothering to get married, because really what's the difference? A piece of paper. The way I look at it, I might as well be married I have to deal with all the same stuff a married man deals with (good and bad!).
That said I'm not against marriage, if my girl really wanted to get married I would do it in a second. Do what makes you happy!
Just don't set a deadline for it. Meet someone nice, get to know them and enjoy your time with them. If it takes you 10 years of being together to get to that point, who cares, you can't force it.
You are probably scaring away a ton of girls be mentioning marriage at the get go! lol.