Masturbation also trains you in self-gratification rather than self-donation. It makes real, responsive, spouse-centered sexual love difficult. It builds up habits and attitudes which sabotage intimacy in marriage.
In my personal experience, this is incorrect. Surely, someone who chooses masturbation over shared intimacy with another is indeed, someone with a problem.
Is your statement a reflection of your personal experience, or something you read in a book somewhere?