Living in an apartment is what has fucked me over. I like living in a small space. But that was fine when everything I did was outside that space - Gym/Pool/Sports/Restaurants.

Swimming is my thing. I don't know why but it makes me feel normal like no other exercise can. but the pools have been closed for months now here in Melbourne (excluding a couple of weeks in the middle there).

Now I'm just depressed, stuck in isolation, borders are closed and can't visit my friends or family. Everyone saying this shit is easy for introverts have no idea. They seem to think introverts don't do anything or never used to leave their house?

Talking to a therapist maybe helps but as other people have said, not knowing if there is any end in sight is what sucks. Not sure why I'm venting to you.

I understand. I think you need to sub in other activities. This could be something like calisthenics if you want something more technical. There's a German online group called Calimove that have an "At home" workout and also some Calisthenics (starting from basics) levels workouts if you want that. There's some free Youtube stuff, and then there's some paid courses that give exact workouts. If something more basic is what you're after, biking or running.

It's a time of adaptation, and it sucks for sure but it's simply Necessary. If I told you what I'm doing instead of olympic weightlifting you would laugh. However it really helps reduce that exact angst you're describing (which I'm very familiar with as well). I consider physical exercise to be as critical to me as everything else, and absolutely essential for my mental health. I happen to be an introvert as well and feel similarly, btw.