It appears by your question that you have dropped out of high school and now want to get a diploma. You should make an appointment with your local high school's guidance counselor to talk about your situation. Based on that meeting a plan of action for you can be developed. For example, your best option may be to get a GED, which is equivalent to a high school diploma.

My main recommendation- talk with someone at your local high school for suggestions about next steps.

Good luck!