I often wonder if this is a strange or unusual way to feel? It's not something you discuss in every day conversations so I have no idea.
I think I have felt this way for most of my adult life but it is getting worse now that I am in my early 50's. In many ways it's the sheer weight of responsibilities I suppose - being a parent, being a child of elderly/unwell and frail parents, money and job responsibilities, looking after and being responsible for your own health etc. There is a big 'responsibility' pattern here, I know. I have never enjoyed having responsibilities but they come with being a decent adult person, there is no getting away from them.
My dh says that when he was a child he could not wait to be an adult and has enjoyed every minute of it so far. In contrast I often say I would go back to my childhood years in a heartbeat but he says he couldn't think of anything worse. He had a good childhood as did I but he says he hated having decisions made for him and the lack of choice which comes from being a child. I, on the other hand hate making adult decisions and the consequences which can come from these, I don't like change or having to make any changes. I loved the freedom childhood gave me where decisions and responsibilities were made by someone else.
I know that does sound very immature but wonder if anyone else feels like this?
BTW, this is all internal, if you knew me you would think of me as a very responsible and adult person.