How to have an orgasm?

Julia • 25 💁🏼‍♀️ Trying to live my best life
I usually use a shower head or have my boyfriend touch my clit and I get to to this plateau where my body shakes and I have to bat away my boyfriend's hand or take away the shower head. I just can't do it. Any tips/suggestions on how to orgasm? Do I just need to push through it? How do I keep my hand on the shower head when my body pushes it away? Thanks in advance