Orgasm in the shower

Okay so I’m very skilled at getting myself off using a shower head but right when I feel like I’m about to orgasm (when I start to shake) it’s almost as if the pleasure is way to much and I need to stop before it becomes painful. I’ve never orgasmed before and would really like to. The shower is the only time I get even close to having an orgasm. Does anyone have any tips? Help me out please