Aw, I'm sorry you had to pull out of the nursing course black-roses but it really doesn't sound, to me, like a case of being irresponsible. And if you're dealing with social anxiety on top of it (untreated?), then those symptoms will double the mental stress of it. It really could affect the ability to focus, sure. Try not to be too harsh on yourself please. Practice of mindfulness can really help to improve focus and coping but not necessarily remove symptoms of SA.🙏