Well, recently I have been using my free time to research some physcology lately, and from what you have said you sound exactly like me. I too get nervous in big groups, and I don't think that this is necessarily anxiety. May it be a contributing factor? Yes. But you are most likely an introvert, or a person who is more comfortable bring by themselves or in a small group. I found that I mostly get my anxiety at night time, because I have been through the stress of today, and have been overthinking way too much. But that's what anxiety is; overthinking. I am being very hypocritical here because here I am, sitting before a computer screen dishing out advice to a complete stranger that I can't even follow myself. But if it helps, I've found that if you save some of your work until the time when your anxiety level gets the highest, and you do your work then, you'll be preoccupied with whatever you are working on, and won't have as much time to think or overwhelm yourself. I've also found that if you do one of your hobbies at night, that helps as well. For instance, I enjoy writing, so I often wait until night to do that. I do think that meditation could also help. I would maybe try getting a few scented candles, something warm such as vanilla, nothing too exotic, and play some relaxing music, and just maybe right down a few positive things about your day, and then do this right before bed to put yourself as peace. I surely hoped this helped, and I hope you feel better! :)