TL;DR want to marry but still lusting over others, how to cope?

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TL;DR want to marry but still lusting over others, how to cope?

I've been dating this girl for many years. She wants to get married soon and start a family some day, and I do too. I love her, love being with her, think she's one of a kind, she makes my life better, and I think she'd make for a tremendous wife and mom.

However, I have one nagging, very petty issue, and it has to do with her appearance. Many would call her stunning, and I think she is too. But on the sexual side, I wish she were more petite, and that she had bigger boobs. I get really turned on by those aspects in women. My girlfriend doesn't have those, and I'm not as turned on by her as a result. We have a pretty good sex life, but she doesn't turn me on the way some past partners have.

Of course, it would crush her if she knew I had this doubt. What I'm trying to understand if it's a real concern or if it's some perfectionism or avoidance thing, or if I'd regret it later if I acted on it. For instance, if I decided it was a dealbreaker and I broke up with her over it, I mean I can't even picture that, it seems so ludicrous and like a waste of what is probably the love of my life.

When I'm with her, I feel deeply in love, there's not even a shred of doubt there. And yet, whenever I meet someone new, in the back of my mind I always wonder if I should be trying to find someone who hits all the same points my current partner does, but who turns me on more. I feel really petty typing this though as I could never just "replace" my current partner.

What would you do if you were me?