Do not listen to them....LOL
Well if you wish to stop, but cannot...it means you are
addicted. You can browse the internet to seek help in
fighting addiction in general. However....
Speaking from health perspective, there is nothing medically
wrong with the practice of masturbation if done properly. In fact,
some health authorities from Britain and Spain conduct education
for students to reduce unsafe sex by promoting this practice.
The choice lies on you.