How does a guy overcome insecurity of being w/ a woman who comes from money?

I am dating a woman (w/ the intent to marry) who makes very good money and comes from family money. I grew up middle cl and am quite intimidated by this. This is every man's dream however "the dream" is causing me anxiety because I'm not able to match (even come close) what she is brining to the table. I need advice on how to overcome this feeling of insecurity and get comfortable with the reality of it. I feel very immature because of my insecurity and never thought it would be an issue but.... And in case you are asking yourself, she doesn't act like she comes from money but because it is part of her life it reveals itself in various ways, thus I cannot just ignore it.