How do u know if u have ADD or ADHD?

I can pay attention in school and stuff and get good grades, but it takes me a long time to do my homework because I'm always taking breaks to do other stuff. Also, I can't sit still for a long time. Like when I'm in school, or even at night when I'm trying to fall asleep, like every five or ten minutes I change my position. Are these symptoms of ADD? Or ADHD? Whats the difference between ADD and ADHD? What are other ways to tell if you have it? Thanks! <3

6 or more of the following symptoms of inattention, OR hyperactivity/impulsivity, or both persisting for the last 6 months or more

Inattention Symptoms (6 ore more symptoms for 6 or more months)
1.Fails to give close attention to details and makes careless mistakes
2.Has difficulty sustaining attention
3.Does not seem to listen
4.Does not seem to follow through
5.Has difficulty organizing tasks
6.Avoids tasks that require sustained attention
7.Loses things necessary for attention
8.Easily distracted
9.Forgetful

OR 6 or more of these symptoms for the last 6 months
Hyperactivity and Impulsivity
1.Fidgets
2.Leaves seat
3.Runs about or climbs excessively
4.Has difficulty with quiet, leisure activities
5.Is 鈥渙n the go鈥?or 鈥渄riven by a motor鈥?br> 6.Talks excessively
7.Blurts out answers
8.Has difficulty waiting turn
9.Interrupts or intrudes

ADD is the same as ADHD