Someone tell me!!!

Sometimes I feel like I have anxiety, but I don't actually know. I get nervous talking and sharing my opinion in front of people that I don't know well. I start shaking, my voice wavers etc. I know the difference between anxiety, anxiety attacks and panic attacks, and I've only had a panic attack twice. Sometimes, randomly, I just feel so trapped. Like I have to get out of there right now because I take up space and I'm bothering everyone and I'm doing something wrong, but I can't without making a scene, and then people will just think I'm drawing attention. Maybe I'm overthinking this and it's something that everyone goes through, but nobody talks about, but please tell me what you think if you have experience with this type of thing. Thank you