This is so touching and so personal to me. I have found myself in the same situations. If anyone thinks nurturing and stability during the formative years isn’t important, read this, then read it again. Unhealthy childhoods often create broken, lonely, disconnected adults.
Appreciate the relationships you do make and just know very few people are truly in your life for all seasons. When it’s time to root, hopefully you’ll be able to overcome the fear and do so. It’s a process years in the making, don’t rush it.