What @bleedingdirt said. To get an idea of how avocado tree looks in different seasons in So. Cal, @Richard has a nice thread here on his Reed tree
Also, the lack of fruits may not be due to just the lack of care. It could be a seedling that won’t produce much or won’t produce in your climate. I think the latter doesn’t apply to you as much in So. Cal as it is up here in the Bay Area. I’d wait for one season and think about grafting known varieties if fruiting doesn’t pick up.