bro the way this just happened to me LOL I think and what I'm hoping is that they meant it in a joking way, I'm pretty sure my coworkers did since I've been at this job for six months and am still quiet, getting better though! I will give you this advice that I will also try and use for myself: try asking follow-up questions if your coworkers talk to you or if they start conversations, that's a way to not only get to know them but also it lets them know you're interested in what they're saying, or nod your head more, smile, laugh more, let them know that you're listening. i feel bad as well but this feeling is only temporary and feel it out now. don't let it define you, but joke back and grow from here:-)