I am aloof and reserved. I know I come across that way and it is fair comment.
I'm not shy. I used to be- I would feel physically awkward talking in a group or being the one to strike up a conversation. I was very literally self-conscious and would have a running commentary in my mind on how I was behaving and being perceived. I actually worked quite hard at one point to turn this commentary off and to make a real effort to join in conversation.
Now, I am not at all shy. I would describe myself as a 'gregarious introvert' in that my default status is being quiet and listening, rather than talking and engaging. However, I very rarely feel awkward in company and actually really enjoy meeting strangers and having those dinner party type conversations. I am quite good at turning on the social charm and having interesting conversations with people I don't know well or at all, and am able to create and draw people in to a lively discussion at parties etc.
My problem is that, as I said, my default is quiet reserve, and the social charm is like throwing a switch- it is either on or it is off. If I am in a group where there are a few naturally chatty people I will quite naturally take a back seat in the conversation and not say much. I think the contrast between this and when I have the charm turned on is what makes me seem aloof. I also think that perhaps I ask people too much about themselves and don't give enough away about myself, in fact I have to remind myself not to interrogate people too much.
It is an easy technique to get and keep a conversation going, but I think it adds to the general impression I give of being aloof.
I do think I am a nice person though. I am very loyal to my friends, I go out of my way to do things for them. I take a genuine interest in their lives and remember what they have told me. I never --or very very rarely- speak ill of anyone or gossip behind their backs. Where my aloofness causes me problems is moving from the category of 'interesting casual acquaintance' to 'friend'. I am good at the former and once I am in the 'friend' category I am ok, but it takes me a very long time to get from one to the other.
I would like to know a bit better how to fix this, but largely I accept that this is my personality and something I just have to work around.