How can someone expect someone to be happy all alone?

Like not having any friends like I had had conversations with my sister and she goes some people want to be in your spot so bad referring to the fact I have a nice job, a dog, my own car and a nice apartment. My response to her is what does all that mean if you’re not happy besides the dog it’s all material. I used the analogy of celebrities they make a shit ton of money and live lavish lifestyles and some still aren’t happy on the inside. But for her I’m just supposed to be ok constantly being alone

How can someone expect someone to be happy all alone?
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