Do you wish you had waited longer to have children

Just wondering for some people who had there children young-youngish like teens to early 20s do you wish you had waited longer and why. Only asking because I’m 21 and I have a 7 year old sister and by how much she annoys me I don’t think I could handle having a kid so young. I can never watch a movie because she talks and interrupts the entire thing I can’t be in my room alone or take a bath alone and she literally NEVER sleeps it could be like 3am and she will be in my room jumping off the walls 😂so just wondering how younger people cope