I think I can't live without the Internet, because we are familiar with the internet life. If anything, elimination is hard and life may be more difficult.
I thought I could not live without the internet, because we are accustomed to the internet to life. If the cut-off would be tough and lifestyle may be more troublesome.
I don't think I can live without the Internet because we are wont to maintain direct Internet in life. If the cut would be difficult and life may be more difficult.