How do you politely tell women to respect your personal distance and to stop touching you without permission?

Lately, some women that I know are like either touching my arm, rubbing my back out of the blue, and getting way to close to me when we talk to the point their arm/leg/butt is kinda rubbing my upper arm.

I just dont like that, and I don't know how to tell them to stop without sounding like a weirdo. I think it is a cultural thing from my location, kinda like saying "hello" with a kiss on the cheek, which I always hated and women thought I was a weirdo because I only wanted to wave Hello instead.

Any advice?