you can always improve yourself if you try hard to improve yourself but feel like you didnt get any better then try even harder. you might not notice it but you'll slowly improve. i too fell anxiety when im in a big group conversation. so sometime i feel like i rather be alone then in a big conversation. sometimes i feel like im not being heard but sometime i get tired of running a way and hiding so i force my self to stay and converse with them. the only way to get better is by practicing and pushing your limits. its hard but when you get past that hurdle you feel good about it. good luck.