In My Own Little Corner, In My Own Little Mind

Sometimes I think I spend too much time in my mind. Like when someone says something to you and you think you've answered them, but really you forget that your part of the conversation is actually not taking place out loud? I say I don't expect people to be able to read my mind and for the most part I don't, but I do sometimes forget that people need clues to what I am thinking or intending. That being said, I wonder just how much of myself I share with others.
I often find myself thinking how little people know me even sometimes my closest friends. Then I wonder if I should really expect them to know certain things about me, like how there are certain things I do not like to talk about; not because I am ashamed of things, but more so because I do not like fuss. Sometimes when I buy something new like a braselet for example, I don't like to show it off right away, rather I like to keep it to myself while I enjoy the newness of it. Then I'll casually wear it somewhere.
Then I think to myself,does anyone ever notice this stuff about me and if so would anyone even care? Or is it even reasonable for me to expect that someone might notice? It's not exactly something you could ask a person either; "Hey do you ever notice how I act when I get new things,?" So I am at a dead end. On the one hand, it would make sense for my close friends at least to notice these little characteristics about me, but on the other hand the things they don't notice, is it because I don't share enough about myself?
I do try not to talk about myself too much largely because I don't want to feel conceited, but also because I am somewhat insecure and I don't think people care all that much. I suppose that is something like my facial expressions. Sometimes I wonder how much people can read what I am thinking or how I am feeling from my face, but I never get a clear answer whenever I work up enough nerve to actually ask someone. I figure for the most part that people don't pay any attention to my face because there are times I have forgotten my glasses and almost no one ever notices right away.
Although I did once have an aquaintence comment that he liked to watch the expressions on my face. He made this comment while I was listening to a new piece of music he had just mixed. Of course it confuses the issue whenever I remember that. I know there are other ocasions that people have looked at my face and said "you looked mad" or "you looked really excited" or "you smile a lot." Then there are the times when people have said things to indicate that my expression was unreadable.
And then there are those times when nearly everyone gets it wrong; those times when someone thought I looked really tired when I am just bored or pensive, or when someone thought I was looking at them expectantly when really I had spaced out and just happened to be looking in there direction. So it all boils down to can people actually read my facial expressions when I am not merely reacting to something, or do people even pay attention?
Alas, perhaps I am just not socialized enough. So when my friends do something that makes me think you should know better, I'll just have to think to myself that it's too bad no one really knows me. Then of course because I think entirely too much--yes that is possible--I start to thinkhow well do I really know my friends? Do I pay enough attention to notice the little things about them?