It is the fear of failure. I think back to my teen years and I know I have struggled with this since then. Possibly before this but I was too young to maybe be aware of it. I am not sure if this was learned or not but I am so afraid of failing that it has greatly hindered my life.
I think most people have issues with this, be it anxiety or not. It is perfectly normal to have a fear of failure but it only becomes a problem when it hinders your life as you mentioned. Have you considered speaking with someone about this?