Hi turkboy, welcome to HW we are glad to have you join us here. I am so sorry for all your going through now. I know its really hard to be positive when you dont have peace in your home.
I wonder how old you were when you moved here? The reason I ask is that perhaps your parents most especially your father doesnt see the situation quite like you do. Such as your computer usage, to you it is a tool for communication, learning, and also entertainment. To your father it could symbolize the downfall of the western world (just throwing an idea out there, not saying this is correct).
What a lot of kids and also parents dont often stop to think about is how their communication style is going to effect one another. Your father yelling at you in the manner he did has left a lasting impression on you I am sure. When instead he could of explained calmly to you what his issues were. I am not saying that what he was saying isnt right just how he said.
Perhaps, you could write him a letter and explain your reasoning to him if you think this will help matters.
I am sure other members will also post to you suggestions so in the mean time hang in there and try to have a good night.