Definitely reach out to a suicide hotline or a therapist if you feel like harming yourself!
Everyone is good at something! Everyone! It just takes longer to discover for some (especially when you have ADHD).
What make you feel capable or fulfilled when you do it? Focus on expanding that. And, remember, your life has far more positive impacts on others than you know, and that is an achievement.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism