you need to go through your ISP for internet access, that;s the service they provide.
yes, you can (but shouldn't) use any ip address you want, and send stuff to the internet,
the problem is returning traffic, internet routs will send the traffic to the real 175.*.*.*
network and you will never see the traffic again, you will also be block holing yourself,
you will never get to any internet service in that network range that you "borrowed"
"If you're good at anticipating the human mind. It leaves nothing to chance."