nature vs. nurture

Are humans defined by their life experiences or through genes?
I was thinking about doing my paper on this topic, because I have always been really curious about this. I've wondered before, if I was born to a different family or even if I had the same family, but my home life growing up was a negative experience, if I would be a different person today. If I had a bad home life, or different friends and different life experiences, would my temperament be different, would I be a"bad person," would I still apply the same morals, principles and beliefs to my life? On the contrary, if humans are defined by genes, would I still be the same person inside, no matter what I experienced in life?