Can someone please explain this popular saying to me? (Loneliness)?

"If you don't enjoy your own company then no one else will."

OK, to me when I read this, it sounds like whoever is saying "If you feel lonely, that means you have a problem/ you don't like yourself and so no one will want to hang out with you because your company is not enough for you."

Is this what people mean? I definitely enjoy me time, but at the same time, there are times, especially when I go to work and see so many people happily hanging out with other people/ boyfriends/ girlfriends and I feel really lonely. I've drifted away from most if not all of my real life friends Does my feeling of loneliness indicate I don't like myself? I fully accept myself and refuse to change who I am and love my weirdness. (It's why I like spending time with myself But is my loneliness an underlying signI hate myyself?

Thank you!