@parus I guess I am very fortunate, my club is not that crowded during the day overall. Sometimes when I am in the pool doing my own thing I am the only person in there! I do enjoy the classes and despite also not being outgoing in person I have found that there are many really nice people in the classes, ages varying from about 50 to 80 with a few men also. I really have to force myself to go much of the time but afterwards I am so glad I did and I find it uplifting. There is definitely something to this endorphins stuff, plus I just feel a good feeling that I made myself do it.

Even the upper gym does not get that crowded, the lower gym is where the real diehards are. When my son is home I bring him along and he goes to the lower gym, I go to the upper or to the pool. The gym and pool are not noisy except for the sound of the ventilation system in the pool. I wear hearing aids and am able to stream music directly into my hearing aids which makes the pool marching go by more quickly. I never put my head under.

I would love to try Tai Chi. There are many classes at my club but not that. I have tried Pilates Reformer and a little yoga.
If you have a health club like that nearby you might consider getting out and doing what most of them allow, a free introductory visit.
My memory is terrible so I do not remember where you are, but it sounds like you might be somewhere in the northeast also with those temperatures. I am trying to will myself out to the club today so I can vary my post knee replacement exercise - my ortho is very much in favor of pool exercises and recumbent bike, both of which are my primary exercises.

I hope you manage to get out of the slump you are in, you sound like a strong person so I know you will.
JK