"Dyspraxia entails the partial loss of the ability to coordinate and perform certain purposeful movements and gestures in the absence of motor or sensory impairments."
Sounds like mommy is right. Your mom, or me, cannot diagnose you, becuase we are not doctors.
Go to one to get evaluated properly.
Also, ask your mom if something happened to you during birth. Becuase it could be acquired, or that you were "born with it".