Invisible

I have bad social anxiety especially when it comes to groups of people. Even family. At my bfs house this weekend all of his cousins were chatting having a good time outside and there I am, the misfit just sitting there. And I know I can't sit there letting my social anxiety show so I say things to contribute to the conversation and I make some jokes and it's like no one even acknowledges me or anything like I'm invisible. It's like no one heard what I had to say. My voice doesn't matter. And I tried so many times and I got so upset by it I got up and went inside to just breathe and be alone for a little while. I hate being invisible. I wish I mattered. Idk how to overcome these feelings of being invisible to people. I spoke loud enough too and it was just like a slap in the face. I get so hurt. Any advice would be greatly appreciated. :(