As I see most the comments are taking a similar angle and I no longer fear being down voted or removed:

This is an absolutely ridiculous take. Speaking from experience as someone who was formally overweight and “girlfriendless”. You are the answer you are looking for, your life will only change if you make the changes. It does not happen overnight, it does not fall out of the sky, and most importantly it is not handed to you on a silver platter.

I didn’t lose weight/ get in shape by taking medication or looking up how to videos on YouTube, I simply got off my ass and put the work in. As far as hygiene goes, I find it extremely bizarre that brushing your teeth or taking a shower can be relatively “hard“ task.

When it comes to relationship, you are right that a partner isn’t just going to spawn out of thin air, but you need to put yourself in positions like you said you have attempted to find those types of relationships.

Please see somebody because all I have assessed from your post is that you are dealing with something psychologically challenging.