When does “we” include yourself?

Sometimes people will say “we are all going to…” but that’s it. Is that an invitation to join them. I use to think it did until I realized it didn’t include mean I was invited. For example I was once told “we are all going to take a group picture” but what they meant was “we are going to be in the group picture, but we want you to take the picture.” So why shouldn’t I always assume that when people tell me “we” that it doesn’t include me?
When does “we” include yourself?
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There’s also been times when after they all went and I didn’t they would ask why I didn’t go. That the “we” was an invitation.
When does “we” include yourself?
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