What are the hormonal, mental and chemical differences between str8 chicks and s?

we aren't the same. that is obvious. i am butch and i am sooooo different from my sister who is str8. she is all girly, high voice, curvy hips, acts like she likes the man to take control, catty, bitchy...i am a laid back guy, a more athletic figure, lower voice, not girly in the slightest. any ideas?