Yes – aloof, intense, intimidating, "scary" 
But, from the POV of someone who wants you to be chatty and put them at their ease, I can see how that happens. They're thinking "why won't you just join in and interact like everyone else, then I can get the measure of you and feel comfortable". You're thinking "Ugh you're being so fake, I can see right through it and it puts me right off". No wonder it's alarming for them.
I also do have some friends. There are some people who are genuinely lovely, kind and accepting and with them it doesn't feel "fake". And there are people who just talk about interesting stuff, and I like that and find it much easier to chat then. Those nerdy friendships where you just talk about a shared interest.
But one of the friends I love most is super sociable and friendly, very beautiful and popular, but underneath it all she's incredibly uptight and anxious, and I think we get on because she knows I know that about her and I don't mind – it's real, I can relate to it and I appreciate her showing me the "real" her. In return, she is very accepting of my oddness and the fact that I just don't "do" that stuff well. I think sometimes the fact that you are not playing the same game can be helpful to people IYSWIM. You are not competing, you just are what you are.
Because actually, what I've noticed about social rules, jostling for position and game-playing is that it makes a lot of people unhappy, even "normal" people who are into doing it. In that world, people are always looking for ways to subtly exert power over each other and stake their claim, and it's a bit dog-eat-dog. Like all the threads about cliques and put-downs at toddler groups and school gates. I like not being part of that stuff, I actually think it's really hard for a lot of people and yet they feel they have to engage with it –because otherwise they would be "aloof", the ultimate social crime.