I think how your feeling is typical and normal to be honest.. You expected people more your age and they are not , Apparently they aren't the emailing type which means more time just planning things. They also don't fit into the age and professional areas you would like them to.

I would use the reason being work issues must come first.. Maybe just stick to one that is of most interest to you.

Just hop off the guilt train now... I think damn near all of us over extend ourselves at time.