What is the difference between AvPD and SAD? And how can you have both?

What’s the difference between being avoidant, and being limited by anxiety? If anyone here knows.

I was recently diagnosed with AvPD and I do relate to a lot of the requirements, however, after looking through this subreddit and resources online, I’m unsure whether it is AvPD or caused by my social anxiety. I am being referred to group therapy for the AvPD and will learn more about the illness then, but how is it any different from social anxiety? I have SAD diagnosed too. What exactly makes them two separate illnesses?

There is a lot of things i WANT to do and achieve, but i avoid it because of the fear of being excluded/rejected etc. There are specific situations and places i avoid because of panic attacks in the past. It’s affecting me a lot. I have Anorexia too, these are all very comorbid disorders. The anxiety is what’s preventing me to get better for the ed. How can the AvPD diagnosis make me receive better treatment options?

These might be stupid questions but I’m trying to learn more about the disorder, and it’s easier asking people with the same diagnosis personally rather than googling. se.