Nearly everything you can imagine! I'll go over a few of the big ones.
Lying down: At my size I can only lie on my back. Lying on my side or front is simply impossible. Being on my back isnt comfortable by any means, as my boobs both pull and push hard against my chest, and try to roll over my face. It's rather exciting though 💦 The act of lying down is pretty tough too. I have to slowly position myself and then lower down gently.

Sitting at any kind of table: This one is obvious. Depending on the table sturdiness and available space, I might not be able to sit down. Coffee shops, cafes, restaurants, offices, libraries... all impacted. Anything that requires space immediately in front of me is either severely awkward or impossible.

Cooking and eating: This ties in with the table thing. You'd be amazed how difficult it is to eat normally with a knife and fork with two gigantic spheres in the way. It's challenging but I make it work.

Travel: Cars, bikes, planes, heck even public transport simply aren't built with absurd proportions in mind. I can't drive or even fit comfortably in the side seats. I have to sit in the back middle seat with awkward seat belt placement. I can squeeze onto a train or bus if there's room, but not comfortably. I'm usually left with either walking where I need to go, arranging taxi/uber rides, or travelling with a friend.

Health: Seeing a doctor or any kind of health professional goes just about as well as you'd think. I'm constantly warned about the risks, damage to my body, and potential consequences of my choices, all of which I'm aware of and accept. If I'm ever in need of surgery, a scan, or a simple a dentist appointment, all require special accommodations to get around my size.

Exercising: I have to do this a lot, but it's far from easy. Who'd have thought that artificially ballooning parts of my body to an extreme degree would make it a struggle to keep fit? Some forms of exercise are either too difficult or too dangerous at my size, so I do what I can to make sure I can still independently look after myself.

Thats a few of the big ones! If it sounds like I'm complaining, believe me I'm not. The challenges are plentiful, the struggles are shockingly real, but the experience and rewards are what I live for 💙