I have a short hairstyle, and I've very quickly fallen in love with having shorter hair. It's easier to maintain than long hair, quicker to straighten, and I just think it suits me better than long hair.
I wouldn't say short hair necessarily makes somebody more andro, there's plenty of short hairstyles which look extremely feminine. I will say that short hair seems to give off a different vibe than longer hair, short hair seems to have more "attitude".