Only child here . Growing up I enjoyed having my parents to myself .
I could also see that I had a slightly better lifestyle than some of my friends who had a few siblings in the way of more days out , holidays to nicer locations , more Christmas presents , clothes , books etc .
Was I a spoilt child ? No not really my parents were quite grounded and I didn't particularly come from a rich , privileged background , but they did invest in me with their time and love etc .
Was I ever lonely , yes sometimes . I can remember during the winter months and you can't go out to play with your mates , thinking they can still have fun indoors with their siblings whereas I was at home alone ( obviously parents about )
I have sometimes felt I've missed out by not having a sibling ( sister especially ) but having one does not guarantee a good relationship with one .
Both my parents are now dead and I am conscious that I have no-one to share the memories of my childhood with and remember my parents with .
In conclusion , do I feel I missed out ? yes a bit , but I had great parents to myself and have lovely memories of them that I don't have to share .
It's ok to just have your one child . You can put your everything into them and give them all your time and effort . You ( and them ) might have some what if's but they will always know they had you to themself and were loved and surely that's what a child needs irrespective of whether you need a sibling for them .
Sorry for the long post .