The good news is that your child will probably be fine, although you may find they they need to distance themselves from you, especially emotionally, to feel like they are able to make their own decisions about life.
Continuing to be codependent on your child as they become older teenagers and adults is most likely to impact the parent, as their child rejects them to some extent. Older children may feel controlled or suffocated by their parent’s need to be too involved in their lives. This often leads to them shutting their parent out of their lives, and keeping their feelings to themselves.
Whilst this may feel distressing for the parent, it also leaves the adult child with fewer people to turn to in times of crisis. If you can let your child have their own emotions without making your happiness dependent on theirs, you’re much more likely to have a satisfying adult relationship with your child.