Welcome to the forum. You are now a member of our community, where you will find support and advice from other members in similar situations. It's always nice to find someone else who understands, and to know you're not alone.
We have sections in the forum that address specific concerns, so feel free to post or start a new topic in the section that best fits your situation. Feel free to explore the rest of the forum. You may find the other topics helpful, and you may be able to offer advice or support to someone else.
We also have a chat room for members over the age of 18. Once you have made three meaningful posts, you will be allowed access to the chat room.
Sadie, what you are experiencing is Social Anxiety. I know, cause I also have a bit of that. You are way too focused inwardly. You think ppl are judging or making fun of you, when they probably aren't even thinking about you, because they are focused on themselves. You will find help and support here at AZ, as many ppl here also have these issues.
Good luck to you, and again, welcome to AZ.