I am concerned I may have an XXY or XYY condition. I suspect a condition for several reasons. Firstly, at 21 years of age, my secondary sex characteristics are typical of men much younger. By this I mean in terms of hair. I still have very scant facial hair (like a typical high school boy), and only the beginnings of chest hair. The rest of my body (pubic, underarms, legs) seem normally covered. Voice is normal adult male. Genitals are normal. Penis 6 inches erect, each testicle slightly smaller than egg, about 2 inches long, and semen production fine. Secondly, stature is very tall and my appearance youthful. At 6 4/5 , I am a full 2-3 inches taller than the next tallest person in my family (father). My muscle tone is good, thanks to an active lifestyle, and my body fat is low, at about 6%. I have a lithe, youthful figure, which is unlike most people my height, who are usually much more muscular and/or fat, with broader shoulders and manlier physiques. My limbs are all very long and thin, and my feet are huge (Size 14 shoes). My shoulders are about 18.5-19 inches wide, with somewhat short clavicle bones. Chest is 36 inches circumference at widest point. Rib cage seems small, and lower back has poor muscle tone. Waist circ. is tiny for my height, at about 30-31 inches. Hips are 35-36 in at widest point (hip/waist ratio about .85). Buttocks and thighs muscular and pronounced, but not fat. Hip bones themselves seem less wide. If I pull tape measure tight, I can reduce hips to 33 inch wide. Mental characteristics: Social anxiety, depression, some schizotypal characteristics. General IQ measured at 133 (age 20). Extremely high ( 99%tile) verbal ability. Tendency to be shy, withdrawn. Not physically or socially aggressive, but very ambitious and competitive academically. Egotistical, but also emotional, with some feminine personality traits like high empathy and nurturing tendencies