I remember once in high school in a kind of AV class I walked past a video camera that was hooked up to a monitor with a live feed. What happened was that as I was walking across the room, I saw out of the corner of my eye a very nerdy person walking across the room on the monitor, and then I suddenly realized that it was me! I walked nerdy! After that, I actually studied the other kids to see what they were doing different, and I adopted two specific changes: 1. Walk with a strut. To me this felt exaggerated and ridiculous until I got used to it, but it was just what the other [male] students did. 2. Hold my books in my hand loosely, as though they might fall out at any time but I don't notice or care. Those two deliberate self-conscious behavioral changes led to a night-and-day difference in how other kids related to me. I was still a nerd, I didn't become popular overnight or anything, but it made a huge difference. (I went to a big public school where you didn't know everybody. FWIW.)

"Act like a dumb-ass and they'll treat you like an equal."