Changing field from Computer Science to Philosophy
Since you're interested in life and consciousness, you might want to explore cognitive science (including artificial life), which draws from philosophy, artificial intelligence, neurology, and other fields. Your computer science background could help you enter a program like this, and once in, you could take philosophy courses to strengthen your background in that area. Perhaps you could do an MSc in cognitive science, and then you might have the background to enter a PhD program in philosophy.