Talk to Psychiatry on Social Anxiety/stress/ Chemical Imbalance. Really Not Sure.

I have this social anxiety or maybe some other related issue which I can't comprehend on my own, that allows me to talk and speak like a professional orator when I'm alone but as soon as I'm in public or even among those who are very close to me, I can't talk fluently. Lots of stutters and difficulty to bring out certain words. It's like as if I'm enclosed in a shell. There is also some sort of chronic fatigue and stress issue. I just got Tyroid, testosterone and mineral test but can't check it own my on. Again, my problem can be a deep-rooted psychological issue like self-esteem issue or depression or anxiety disorder or it might be some chemical imbalance.