Masturbation finger technique weird??

When I masturbate i kinda curl my right index finger into a C-shape and put it 2 the right side of my pussy and push it up and down really quickly. is this normal? cuz most girls seem to just enjoy it rubbing lightly up and down or around with two fingers. What are your techniques and also does anyone else(girl or boy) get ringing in their ears if they get up too quickly after orgasm??