I am ok doing yoga & calm exercices in my living room in the morning but really struggle to hit the gym for a more ambitious class. Any advice ?

Dave S.
I understand you because I am the same my advice for you is set your mind and use the comfort. Since you feel better at home try online gym membership where you gym from the comfort of your home. Then seeing other people through your phone one day will push you to go to yhe gym.
But take your time
Mete O.
Stick with what you know as long as you’re comfortable, but recognize the nerves of going to the gym won’t fade unless you just go for it, and once that’s over, things get much easier. Clear a new expanse to add to your comfort zone, that’s all it is