Is it weird that my happiest memory doesn’t involve me?

I was 13 and riding in the backseat. My fourteen year old friend and his girlfriend (my other 14 year old friend) were driving to the lake to do god-knows-what and I was third wheeling like a pro. They get out and I stay in the car, reading a book. I don't know how long I read or how long I sat in the car, but when I looked up, I saw them splashing eachother and laughing. Knowing that both of these people had horrible lives and depression, it made me feel really good, knowing that they always had eachother to count on.