i am not a shy person, and most of the times i am very outgoing
but sometimes, for example when i have a new job
i do get quiet at 1st and really observe my surrounding, im picky with the people i choose to considers friends or acquaintances.
I do tend to be a dork many times especially with people i am all too comp table with or friends of friends even, but that doesn't mean that when in an environment new to me.. i wont be rather "quiet" and observant..
maybe even considered shy by others, but really i am just observing how the atmosphere is, and if more maturity is needed or i can just ease up and be myself..
this is some cases of course, and my case too.
but i still don't see "shyness" as a reflection of low self esteem all the time, there are many reasons why people decide to shy away from someone or something.
try smiling more, giving nice gestures and always looking someone in the eye when responding or talking to.
it would help, slowly to overcome shyness... looking away will be a hint of insecurity, and you wouldn't want anyone to think of you that way so easily, you'll be fine though..
do little things you wouldn't normally do, or takes usually a lot of courage for you to do.. and with time, you'll find yourself very comfortable with who you are, and your spirit content with it, as well.
i use to be extremely shy when i was younger, no one would believe i was now, but at the same time, i am very observant still when i meet "important people" to know how to react with thing.