I haven't showered in 3+ weeks.
Seriously?! Why have you not showered for nearly an entire month?
I've been too anxious and depressed to do so.
I understand your struggle, but it's gross that you've weeks without a shower. You should definitely try to force yourself to take one.
Honestly I don't care if I get dirty anymore. I'm over it.
You shouldn't shower just for yourself, but for those who will be spending time around you. How would you like to be around someone who smells and hasn't taken care of their hygiene in three weeks? I bet you would hate it.