I sometimes feel like I'm the only idiot still staying at home while everyone else is going about their life as normal. I know it's not true but there are a lot of people not caring about anything.

Nothing has changed. There is still no cure, no vaccine, the virus is still contagious. As I keep seeing online a lot: The end of stay-at-home orders doesn't mean the pandemic is over. It means they currently have room for you on the ICU.