Shower Invite Problems...

I'm not inviting every wedding guest to my shower. Is this okay? I wanted it to be more intimate. Closer friends and family. My FMIL is paying for it. It's on april 26th.


My FH's grandma (who I'm close with but does not get along with FMIL) thought all her female friends and family were invited to my shower. But not all of them are. And she's upset her one friend wasnt invited. I feel like this is going to turn into a much bigger invite list if I listen to every complaint from everyone...
Did anyone else experience these issues? I didn't really want a shower to begin with, I feel weird about receiving gifts. But my FMIL said I had to have one, and she wasn't my 1st option to throw it. I would have rather had my sister. But that's just how it happened. I'm grateful, but I'm already inviting people I don't really care about and this shower is stressing me.out more than it needs to.