There are many ways to abuse yourself: excess alcohol consumption, overeating, and being addicted to shopping or gambling are just a few of them. Any activity you compulsively pursue which harms you in a significant way is self-destructive.
As a teen my destructive behavior consisted of spending whole days in front of the computer, overeating, and totally avoiding any physical activity. When I turned eighteen I was drafted to the military service. This forced me to completely and immediately cut these negative patterns out of my life.