Is social anxiety a symptom of MDD or is that just me?

I'm a super klutz because I have crippling social anxiety at times. Also I seem to forget things really fast and I have weak focus.

I'm trying to find out if this cause of my MDD or is there an underlying problem. I'm asking cos I've read that MDD is a symptom and not officially classed as distinct mental disorder.

I know I have MDD for sure I'm just trying to find out of I have a specific underlying issue. Thanks for listening 🙏🏾