The incident took place yesterday when Pawan Mehra rammed his motorbike against the minibus on Kotadi flyover under Gumanpura police station, ASI Manmesh Goswami said.
A suicide note allegedly left behind by him said that he was depressed over being beaten up by his lover's mother, he said.
A case has been registered under relevant sections of the Motor Vehicle Accident Act 1988, police said.
The body has been handed over to the youth's family after postmortem, they added.