I was very lucky, I achieved a lifelong dream at around 32 and the there was this void. I was well away from my peers and didn’t really have much objectives to complete.

On the other hand, there’s a lot of fake on Facebook... like your friend that toured 15 European countries in 3 weeks?? What did he accomplish? An European tour of airports and railways?

There’s something I usually refer to which is the essay/song “wear sunscreen”:

Don't waste your time on jealousy. Sometimes you're ahead, sometimes you're behind. The race is long and, in the end, it's only with yourself.

Perhaps jealousy is a strong word, but it derives from the same place of what you’re feeling.