You need to seek out help from professionals concerning your disabilities–and that’s what they are.
Being easily distracted, failing in school, getting depressed–these have medical or psychological causes, and you can be helped! Lots of children and teens struggle with these problems and assume that it’s just the way they were born (“born this way”), but that’s just not true! You may have some form of attention-deficit disorder, or perhaps a sensory-perception disorder. Nothing to be ashamed of!
Don’t be afraid. I don’t know if your parents are kind and helpful, or if they think you’re a flake–either way, seek out help yourself. Start with your school counselor–that’s free, and I’m pretty certain that your parents won’t be informed if you ask the counselor to keep your visit confidential. The counselor will be able to refer you, if necessary, to people who can help you overcome your difficulties and live a life that you are happier with.
Good luck to you!