So, you left public school because of anxiety and now your mom is causing you anxiety? I'm guessing that you had to tell her about your anxiety and come to a decision together to leave public school, so she can be sympathetic to the stress she's putting you under. She just wants to help, but is getting a little caried away, so she cares and you can use that to start a conversation, like "I know you love me and want what's best for me and I know you are trying to help, but you've accidentally been causing me some anxiety and making it difficult to get my work done. How about I try on my own and ask if I need help. Thank you for respecting my wishes in this." Or something like that. The point is talking calmly and showing you appreciate what she's trying to do while also explaining your situation in a way that shows her you're mature and respectful of both her and of your schoolwork. It all starts with a conversation, so start there. Good luck! :)

ive never been in public school, but i know from a concentration view, homeschool is harder. more freedom with your schedule means more discipline with how you spend the time. i learned this the hard way when i almost didnt graduate. the beauty of homschool is you can (if you apply yourself) get done early every day. but i can see that if you had done public school for a while it will take some getting used to.
hang in there
duke