Trying to find middle ground

Hey all, I'm seeking advice from other couples. My fiancé and I have been together for 5 1/2 years, and we are a pretty good team, except when it comes to money. Throughout the years, there have been times that I made more, and times when he made more. Currently, he makes twice as much as I do. Now that we're getting married, I think it's time that we start discussing turning "my finances" into "our finances". We already own a home together, and even though I make considerably less we still split everything in half. This obviously makes it hard for me. He is in the mindset that his money is his money and is very unwilling to change that. He also spends a lot of money on "wants". I don't have a problem with this except for the fact that these things take up space in our house, which isn't very big. Basically, we need to find a way to compromise. Are there any other couples out there who keep their finances semi-separate or have any kind of alternative solution? I don't want him to feel like I'm trying to take all his money, but something has got to give.