Young people who express their psychological turmoil by directing their negative feelings OUTWARD onto the environment (e.g. vandalism) or other people (e.g. violence) are performing what psychologists term externalising behaviours. This is also known as, more colloquially, ‘ACTING OUT.’
These behaviours are in contrast to internalising behaviours such as anxiety and depression by which young people may turn their negative feelings inwards into themselves.