My girlfriend is so petite that I'm afraid I'll break her, every time I touch her, advice?

So I'm quite big, I'm 6'4, I've been a swimmer growing up and overall quite athletic. My last girlfriend was pretty athletic herself, so that never was an issue but my new girlfriend is so small with almost no muscle at all. She's really pretty and feminine and I lover her but her legs are basiclly the same size as my underarms, my hands almost cover her entire back and generally she seems so delicate that I'm afraid every time I hug, I might squeeze to tight and hurt her.

We haven't had sex yet but that would be pretty hard for me too. It's ridicoulous, how do I get over this?
My girlfriend is so petite that I'm afraid I'll break her, every time I touch her, advice?
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