with what can I masturbate?

If you don't know what to use try your fingers! You can also run the bath and position yourself to where your vagina (especially the clit) is directly under the water stream. Spread your lips that helps. Also for me it really gets me turned on when I slowly make the water hotter. You can use the end of a brush. If you use random object make sure to clean them. Vibrating toothbrush helps as well. You can also use your saliva as a lubricant and get yourself really wet.