Environment's impact on us

Naturally, i will say that i am a soft spoken person. When i was in my country, it was not that bad. I was shy, but i was into stuff and i spoke my mind. I was not loud like others, but I had friends and i was into working and helping others. I later realized that i was the way i was, because my father is like that too. He doesn't talk much either. So i can say that it is in my gene like Steven Pinker says. I didn't have a blank slate when i was born. I took after my father in his character.
But i realized that now that i am here in the USA, the soft spoken person that i am has grown softer. Now i am really shy, i can't speak my mind. It is probably, the change of the country. The environment that i am in now has forced me to be even more soft spoken. So what i think is that first, we have our genes that play a part into who we are then our environment also plays a part in our life.
For me, naturally i think all humans are nice people. Later in our lives we decide for ourselves to be bad or to be good. When some things look like we have taken after our parents, it is probably because we are living with them and decide to do things like them. As we grow up we can decide to not be like them. My brother for example doesn't do anything like our parents. One example also is the Nigerian kid that decided to bomb the plane on Christmas day. He was not a bad person, it is the environment that he found himself in that put things like that into his mind. As human we can decide to be bad or good, no matter how we were brought up.