I'm 5'10.5" and between a size 6-8US (usually a medium). I wear a 34D for bras, so I guess I'm reasonably well-proportioned. I'm considered to be within the normal weight range, according to BMI charts, but all of my girl friends are so much shorter than me, that it's hard not to feel big (or less feminine) sometimes, regardless.
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You are a very tall woman but you sound well proportioned. I'm only 5'8" and my guy is around 6'1 but very thin. So if I pack on any extra lbs (like the 10 I put on over winter, worked back off 6 though so doing good lol), I start to feel big when I'm around him, which makes me feel less feminine :( So I can relate to that feeling. It's natural for you to feel that way being so much taller than your mates but some of the prettiest women I know are really tall. My ex's sister is 5'10" and she's gorgeous. I also work with a nurse who is about 6'0" and exceptionally beautiful as well :)0