Every single ex-girlfriend has pointed out to me that I am very affectionate, whereas all I was doing was being myself. I guess this is because where I come from (Turkey), people are expected to show their affection and appreciation with lots of touching and hugging. For example, when you run into a friend, you usually kiss each other on both cheeks as a greeting. In the US though, this would be considered aberrant behavior - might even be perceived as "gay" if it's two guy friends. Instead it's either handshake or fist-bump.
Suppressing affection is pretty hard. Often times I find myself with an urge to give people hugs, but refrain from doing so.