Originally Posted by Colton_Reeves
I only get time to masturbate when my grandparents are gone or they are asleep and I just pretend that I am using the bathroom because its the only door in the house that locks
There is nothing wrong with what you do, and pretty much most teenage guys masturbate. It would be really hard not to do so especially with all the hormones in your body. Your grandfather surely masturbated at your age, and there is no question he was sexual in his life otherwise your parent would not exist.
I would not think you are doing anything wrong, and don't get freaked out about masturbating as it is normal.