Shy People

I am a shy person. I have never considered myself a painfully shy person as I do start opening up once I get to know someone better and when I am with close friends I am a lot more outgoing towards strangers. But when I am in a situation when I am with totally new people, my heart races and I have anxiety and feel very uncomfortable. Anyways, my boss was introducing me to someone at my job and I was helping him out and he said "she's quiet but gets the job done." And of course, being the quiet person that I am, I did I'd say anything to that. But I was thinking "what is that supposed to mean?" Like does he mean if I wasn't so good at my job that he wouldn't want me there cuz I am so quiet?? I am just tired of people looking down on shy/quiet people and people who act like you don't exist or matter as much. I think that is why I am so humble. Because I am so used to getting left out of things because people just feel like I won't mind because I never speak up for myself. They think I am just being kind. And so I get used to volunteering myself to be the one to not get the goods. And I hear people all the time say about shy people that "they're weird" or "I don't know how I feel about them." And really, I can come out of my shell really fast when people are kind to me and get talkative with me. It makes me feel more comfortable when I see people want to talk to me. Some people I can tell are judging me from the start and that is where my guard goes up and I really get shy. Thanks for listening to my rant. I am just wondering and calling out to any other shy people out there who have similar situations going in. Do you find it challenging being shy and feel the same way that you get put down? Honestly, I have been shy my whole life so it isn't going to change. I have tried to put a lot of effort into being more outgoing but it is draining and way too uncomfortable for me.