I literally don't leave my house and I still gymcel. I workout at my home gym and never leave house, for months. Hardcore rotting mode and gymcelling few times a wekk at home. So lifting may not be just for others. I don't take pictures of myself to post them online or on fitness boards, I don't leave house in tight shirts or whatever, I order all of my food and supplements online and the guy delivers it to me at my home door.
I think I just need this, I love to workout at home even though I never leave the house and have 0 friends or interest in getting them. It keeps me sane and I like the feeling of working hard and sweating, then falling asleep like a baby later.
So you can rot and gymcel at home, without leaving the house and while being a complete NEET rotter. I'm a living proof. And I don't do it for attention, not online nor anywhere else.