How do i tell my dad?

Be honest, well researched and well spoken. Be a bit forceful and don't let him dominate a conversation. Let him see how serious you are and be honest about how difficult life is for you. As a person who has dealt with having to 'come out' to my parents about my depression (both of whom don't believe it is a real thing) I completely understand how hard it is to change someone's mind about it. Remember that you don't necessarily have to change his mind or make him understand. All you have to do is convince him that at this stage in your life this would make things easier for you and perhaps allow you the space and room to grow in order to be able to live a life that more closely aligns with his ideas for you (if that works for you, that is)Good luck!

You just need to be straight forward with your dad. He may not understand your anxiety problems and most people would cast it off as shyness but if you feel uncomfortable with going to a regular school then definitely the online school will benefit you if it relieves some of your anxiety. So tell him that, tell him how you feel when the anxiety comes and how it makes you scared and whatnot, perhaps if you tell him that by transitioning to this school it will enable you to perform better in school will be a good incentive for him to listen. I wish you all the best.

Yeah I think some people are denial that anxiety disorders exist you know? You just need to tell him that you will be happier with the online school and that it will benefit you and your grades and most importantly well-being.

Thank you! My only problem is is that I've tried to tell him so much, but he tells me it's just an excuse. But I do need to just come out and say it. Hopefully it'll work out!