I started high school at an all girls school that would have socials every term with a sister all boys school and thrived. I then changed to a co ed school for my last 2 years of schooling and found it very difficult to adjust as I found the boys to be very imature and disruptive and the girls during school hours were very shallow and very boy obsessed. It didnt help that the school had it so that the juniors all wore uniforms and then the last 2 years they wore mufti. I found this meant there was so much more focus on clothes, appearances and boys. At the same sex school the interest about boys was still there but mainly kept to out of classroom time.