How do you feel about strangers rubbing belly later on?

In all honesty I have a little bit of a personal space issue. I am nervous for when I get noticeable bigger and more pregnant that randoms want to touch my belly, and do without asking. Even certain friends and family members...there are only like 3 people including my husband that I'm ok with really touching my belly and it's really hard for me to even get used to him touching it now. Anyway to get over this? Or be able to tell people "don't touch me" without sounding like a bitch? I think it is sort of linked with a self concious issue I have with being overweight most of my life but even then I've always had personal space issues. I love my bubble of space. I'm 7 weeks today.