You can have hobbies and fun even with children! Not as easy as without but definitely possible! For me the biggest sacrifice was giving up my peace of mind… I used to be relaxed and care free… now I constantly worry for the well-being of my son!
Not entirely true. Like, the way you do anything brain intensive has to be limited if you want to engage with children.
We used to love playing board games, now we either play boring ones, or we selfishly play an interesting one and the child doesn't understand anything. Sometimes that's acceptable, other times we feel way too guilty.
When I was in my 40s I asked my Dad when I would stop being constantly worried about my kids, and he said that he still worried about me :).