Can't seem to get past insecurities about dating a successful woman. How do I deal? Do I just call it off?

This girl and I have been dating for about 2 years now. We’re both in our early 30s.

When we first started seeing each other… like, I knew she was a doctor but the weight of that didn’t really sink in right away. It was really more of a novelty for me at the time (“I’m dating a doctor, harharharhar” you know). We’d meet and she’d apologize for her schedule (she’d just gotten off residency) and since I wasn’t expecting the relationship to last long, I just shrugged it off.

Then one day I realized that I had two different bottles of shampoo in my shower, a thing of “feminine hygiene product” under the sink, and a bra in my sock drawer. Hit me like a ton of bricks. “I’m dating a doctor and it’s serious, apparently!”

The thing is, it’s not just that she’s a doctor. It’s that her entire family seems to be chock full of successful people. More doctors, Wall Street investment bankers, Phds… her dad climbed Everest! People like her, her family, were something that I read about in the paper or saw on tv or whatever, but never real or tangible until I met her.

I work at a managerial job, with okay pay. And the only interesting thing about my family is that I have a gay cousin. And mostly, I’m okay with that. But I can’t help but to compare and then feel inadequate, so I take it out on her, and then we just fight. This doesn’t happen often, but it happens enough.

Recently, she’s been talking about us moving in together. Specifically, her moving in with me. She’s got a really nice condo, and I have a dinky little apartment. So that’s been the argument as of late. I couldn’t afford to move in with her, but I don’t want her downgrading to live with me either.

I want to take the next step in the relationship, but these anxieties of mine just aren’t going to go away and I’m afraid it’ll get worse when we’re finally moved in together. How do I move past insecurities like this?