I have a hard time understanding when people are joking or being serious or being sarcastic i have a hard time understanding social rules and i have a hard time keeping eye contact with people is that apart of my adhd?

You may have autism spectrum disorder. It would be prudent to consult a psychiatrist for an evaluation. Visit this site for information on this topic: https://www.cdc.gov/ncbddd/autism/facts.html

No, these are much more likely symptoms of an autistic spectrum disorder. ADHD is very common in people on the autistic spectrum, so this too would fit the diagnosis. I would see a good psychologist for testing and discussion of treatment options. such as behavioral modification that can help you better pick up on social cues. Don't envision this as bad. Many are very creative and inventive!