I'm not shy but I am quite introverted and let me tell you it is a rarity in a world made for extroverts, so be proud of yourself not succumbing to a world that wants you to be louder and larger than life!
I would say once I get to know people I often come out of my shell a bit. I am a great judge of character, I like to sit back and observe people, read between the lines, watch what people do not just what they say sort of person and this means I don't suffer fools gladly. Usually.
I would say however that sometimes my introverted personality has led me to missing out on opportunities especially in my career, I have held myself back, despite being more deserving of a promotion than the person who got it or missing out on a better opportunity, I have often felt if I was more confident I'd have done better. I admire the self belief of confident people. I think it gets them places that my lack of confidence/esteem holds me back.
I sometimes find when I am with an extrovert, I feel nervous, a little socially awkward and then I really go into myself and struggle to relax and be myself this often leads to people misunderstanding me and thinking I'm snobby/boring etc.I've been known to stutter if I get asked a question on the spot. Sometimes on the occasional day I feel sociable, I become quite chatty and can appear confident but find it exhausting.
Once an old boss who was a larger than life personality, recognised my quietness/introverted personality and in the middle of a meeting singled me out and told me to stand up and make a Baaaa noise like a sheep in front of everyone in the conference room, laughing as he said it...I remember thinking what on earth, why would he do this, turns out extroverts struggle with introverts that don't succumb to the social pressure they put on them. I never laughed at his jokes, or enjoyed his 'banter' in the office so he didn't like it and took it upon himself to try humiliate me knowing I struggled in social/situations of speaking in front of others. Needless to say, I, naively stood to my feet and Baaa'd like a sheep in front of a conference room of 16 people, who looked on at me horrified. Then that night I cried all the way home on the train with my head buried in a book. One of the other team members reported him and he got sacked for that among other things. But to this day it has haunted me that why do loud confident people need to pick on those who aren't like them.