Does anyone here have children or siblings with an enormous age gap between them?

My daughter is about to be 6. I dont have any other children and dont plan on any soon. Im a single mom who had her at 17. I feel kinda bad because i know that any other kids i have wont be close to her, but again, i am not in the position to just have a kid, especially not alone. Alot of my friends(young moms like me), had kids right after the other so they would have a playmate, and they tell me they feel sorry for my daughter. BUT, i dont care because they are all struggling with their 2 kids, while i have a much easier time with just my one. So it has its pros and cons, but more pros in my case.