Yes, I'm an only child, something I've lamented for most of my life. As noted by several others here, that did mean more "peace" in the sense that the house was quieter and less crowded, but I found I didn't have much inner peace. Loneliness abounded, prompting a longing to explore, see the world, and meet new people. Not a bad thing by any means, but as a country boy who grew up in the middle of nowhere surrounded by almost nothing other than fields and woods for nearly 30 miles, with nobody to meet or hang out with with besides a few rednecks harboring distasteful stereotypes against non-heterosexuals, non-whites, and who possessed a patriotism bordering on fascism, this longing went totally unfulfilled until I was an adult. Fortunately I've always been very observant, and thanks to the constant conflict between my sensitive inner being and the callousness and prejudices of the cliché American south, I wasn't unprepared for the new social opportunities, nor was I naive to the ways of the world. I quickly adapted.
All things considered, I would have preferred a sibling to learn from and to teach, regardless of which of us was the elder. Somebody to abate the pain of uninterrupted solitude and who might relate to me, unlike all of my other peers. Had I that sibling, however, I would have ended up a very different person, no doubt; something I'm not sure I'd want to happen seeing as I recently (as in the past several years) became quite comfortable and satisfied with who I am. My life would also have taken a very divergent path from this one, down which I may not have met such wonderful friends (and I daresay family) as I have now. People such as @~Chaotic Discord~, @Chigens and Kay, @Felix, @SCS, and some others whom I've met through this forum are all very dear to me, as much as any sibling ever could have been. The way I now see it, I traded one form of family for another by not having any brothers or sisters through my parents, and this family I've formed for myself I wouldn't trade for anything.
It's been said that friends are the family that we choose for ourselves. To those of you other "only children" out there who may have had to endure or are now enduring a long, lonely childhood, perhaps with with parents such as mine who fought horribly, uncertain of yourself and what life might hold for you later: you have the power to change that. Maybe not immediately, maybe not for a long time, but it is within your ability.