Am I the reason baby won’t sleep longer?

We’ve coslept since our LO was a newborn. He was colicky and never wanted to be put down. Fast forward, he’s 11 months old, still hasn’t slept through the night. We have a floor bed with gates. I lay with him for every nap and sleep with him for bedtime. I also nurse him to sleep.

Last night I couldn’t fall asleep until 1am. He was asleep around 7 and seemed to have a longer stretch. When he woke up, I didnt have to nurse him, just repositioned him and he went back to sleep. But when I actually sleep it seems like the long stretches are impossible. I’m wondering if I’m the problem.

I’m not interested in sleep training but anyone have a similar experience?