The joy and comfort of sitting at a table surrounded by family and friends. It might be a family meal, or a drink and some snacks. Feeling part of something - a fun moment, a joke, sharing stories. Being part. Feeling happy. It's like a reward.
If you can't explain to someone else why moments like those are so important to you personally, it's okay. Maybe you're a bit on the quiet side, or personal feelings just aren't the kind of thing you'd like to bring up. If some of your companions wouldn't understand, it might be because they've had lots more of those happy times than you, and it just feels normal to them, not extraordinary.
Be happy that they have their "normal happy" moments, and just enjoy your well-deserved "extraordinarily happy" moments whenever you can get them.