When im on my nees i get a painat botom of my cap like im neeling on sumthing sharp only in a small place on both nees?

Knee pain: This is most likely a mild prepatella(knee cap) bursitis characterized by tenderness of the knee cap on kneeling. When associated fluid appears,it's called housemaid's knee. Treatment usually consists of nsaids like Advil or Aleve (naproxen) and using a knee pad if you must do kneeling activity. See an orthopedic specialist if symptoms worsen.