Oh yeah, it does suck in the summer, but I've worn black for so long, I'm used to it.

I don't run, though.
Now I most often wear earth tones, like dull greens and reds, browns, tans, and greys. But I still love wearing black. It's slimming and not too eye-catching.
Back when I was in middle school, people thought I was an emo kid because I wore black shirts and jackets all the time. Though I did try a subtle goth-ish style when I could. By high school, everyone wore black, so thankfully I didn't stick out anymore.