You are touching upon something that I've wondered about, where something that was said by a family member before, and I had to think long and hard and ask myself, where it comes from. There is a certain 'fakeness' that comes with being smiley and nice. Not that nice people, per se, are fake, or that people that smile are either.
It's the appearance, factor. I was able to sort through this, at work, where I was forced to stop being pleasing and chronically 'bubbly', and just get honest. It was easier to sort through, as I was working with, at the time, with someone who just always put on that smiling face, and through the stress of it all, I could see, that by not asserting her needs, and being able to say no, you could see the stress factor add up. I was on an AD, while I was sorting through this, which was good, at the time. And in therapy combined with that AD. I was questioning, a great many things, in my life, at that time. I knew, my mom could also be that bubbly person. And she wasn't an entirely fake person, but upon reflection, I realized that by pleasing and being bubbly, it doesn't take one very far into sustainable depth of relationships, outside the family or tight inner circle.
I am not promoting not being polite and kind, I am recognizing why it it, that others find this type of bubbly nice, as 'fake'. It was also, a carry over for me, from my teen years and early adulthood.
Perhaps, it's not a conscious power play from these people in your life, to invite you. What is their level of obligation and reasoning, to invite you, when clearly they aren't including you, while you are out with them?