are you to nice to say no?

Ugh I'm leaving today to visit my dad and grandparents for a few days and I'm 21 weeks pregnant and I know they're all going to touch my belly. I hate when people even my family touch my belly. The only person I want and am okay with touching my belly is my boyfriend obviously since it's his kid. Yes it's exciting since it's my first, and I'm excited as well and I'm the only child and the first grandchild/niece so it's a big thing for my family but I still hate it I just feel awkward. But I'm too nice to tell people not to touch me. Anyone else have the problem?