I have forgotten how to be happy!

Recently I have become increasingly aware that other people seem to have fun and enjoy random things, life I guess! However, I feel like I don’t get it. Sometimes I catch myself looking into a situation where people are laughing and having fun, I really want to join in, but I just don’t get it! A few times it’s been pointed out that I just look miserable. Although I don’t necessarily feel miserable inside, more numb.

Is this normal? Is it even possible to be on the spectrum and experience fun and enjoyment like “normal people”

I am currently waiting for official diagnosis and was told this could take 2 years before current pandemic. So christ knows how long it will be now.