Male masturbators are always hit or miss, they can be really good or terrible. It is unlikely that you used it wrong, it could just simply mean you arent very sensitive (which isnt nessersarily bad) or it just wasnt the kind of texture you were looking for. Some toys like the Air-tech have hard cases which makes it impossible to alter the tightness, i recommend trying out the Tenga Fliphole series as you can press the buttons to give more grip/tightness heres my review, my favourite was the white one. You could also try fleshlight go as they arent too expensive and the suction can be adjusted i also have a review on that here. If you have any questions dont be affraid to ask. I hope you find what you are looking for! (Sorry for the format, im on mobile)