Hi and welcome,
Have you told your parents what's going on? You need to be tested for ADHD. They can also put you on an IEP which would allow you extra time to do you work and get extra help. There is nothing wrong with that.

See your counselor and give them your concerns. The longer you wait the harder it will be for you to catch up.

My son was dx with ADD when he was 3 years old. He was also put on medicine and started special classes. I had to fight for everything he got. 10 years later it turns out that he does not have ADD but an auditory processing disorder along with autism and mild retardation. He did manage to graduate from high school. It took him a year longer and he went to a trade school for merchandising were he received his certificate and he also got his floral design certificate.

Because of his disabilities he does not have to work but he does. He works 5 days a week and between 25-40 hours a week.

Talk to the counselors and your parents you need to get an IEP and that will help you out a lot.

Good luck