“My Friend Dahmer” (** out of four) was a perfunctory biography of Jeffrey Dahmer (Ross Lynch) showing him in high school as a shy young man who struggled to belong and was beset by bullies at school and family problems at home and turned to drugs, alcohol, and later insane violence. Curiously remote and unrevealing story presents Dahmer as an outcast in the mold of “Carrie” but doesn’t tell you much about him you probably don’t already know. Performances are fairly one-note as well, much like the film itself. For a more striking and gripping film about same subject, watch 2002’s “Dahmer” with Jeremy Renner instead.