What does it mean when a girl is "intimidating"?

Recently, more and more people have been calling me "intimidating", and my 5'2 1/2 ass is confused. I definitely seem to give off the "too-cool-4-u" impression according to people I've asked, but intimidating? That's just bizarre to me. Sure, I have a generally edgy sense of style (black, edgy band t-shirts + ripped jeans + flame sk8-hi vans and the occasional camo trench coat is my signature look), and I do have my headphones in a lot, but I didn't think I was that unapproachable. Apparently I am. I carry myself in a confident way, always have winged eyeliner, and I generally seem cold (even though I try not to be.) When someone says "Hi!" to me while I'm walking, I generally don't respond because I don't know how to respond. I usually just give them this half grimace-smile (the kind you give strangers when they hold the door open for you). As a result, I guess I seem unfriendly? I also tend to blow off guys- if a guy I'm not interested in tries to flirt, I'm not gonna hurt them by giving them false hope. I tell them straight-up that I'm not interested. I also hang out in ~edgy~ places like a skate park and have friends who are nicotine and marijuana users (I'm not a nicotine user at all, no addictions for me amigos/amigas, I'm too broke for that) so that may be a factor. Do they mean that I'm intimidating in a bitchy way or a "she's too good for me" way? (Attached a photo because my face might be a factor in this. I'm the girl on the right. Yes, I know I look like a fetus, but when I'm 30 imma be lookin 20 and y'all will look 40.)
What does it mean when a girl is "intimidating"?
What does it mean when a girl is "intimidating"?
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