Honey, this SOUNDS very nice how you put it - but it is ALSO very self-conscious, and that becomes a lot of work in the long run. Believe me.
Next, - if it is second nature to you then you will hardly notice what's actually going on - so my own experience too.
There are of course pretty wrong ways to sit as a female, not being lady-like, as in spreading legs open gypsy-style, and e.g. putting an ankle on one's other knee, putting one's arms behind one's head, or showing your underarm 'situation' – 'more betta' it be waxed, eh. Etc. etc.
My point is that these things better be/come second nature, lest we look like some awesome version of a trans-diesel-dyke, not so many of us aspire to.
Will hormones help? In the right regimen I think they will help - again my own learning.
Yet, once you are 'there' you will get less and less self conscious, AND NOT easily slip up into some unbecoming posture or composure mode - i.e. you will actually have acquired some female grace, and how nice it will be :-)
Now good luck with it,
Axélle