How do you deal with people touching you

I really hate when people touch me.😠 I'm worried that when it's time for my baby shower everyone is going to trying and touch my belly.😬 I feel like I might snap if it happens that or my face will just be very obvious I'm not into being touched.😒 I'm already stressed about this baby shower because there are certain people I dont like that will be there. Apparently i have no say on who is coming 😑 any advice? Should I just tell people not to touch me or just tuff it out😳