Mastrobating?

ok so i saw a question that said sumthin about mastrobating with a showerhead. Does that mean u have a bath goin and you put ur up to it and let water go in it? isnt that like douching then?and ist douching bad? thanks! This is serious im only 13. i dont know everthing. give me a break out there all u ppl out there who are probably laughing at mi ques. Thanks!