Why did Eddie Brock become Venom?

Why did Eddie Brock, a journalist with a troubled past, ultimately transform into the iconic Marvel antihero known as Venom? Was it a desperate attempt to gain power and control over his circumstances? Or was it a tragic consequence of his encounter with an alien symbiote that bonded with him against his will? Did his inner turmoil and struggles play a role in this transformation, or was it purely a matter of fate and circumstance? What drove Eddie Brock down this path, and how did he come to embrace the dark and powerful persona of Venom?