You seem to be a nice person. Don’t give up. I hope you find your people and I’d be happy to have positive people like you around me. Do you read about Buddhism and metta at all? When the whole world can show love and respect to themselves and others it will be a better place, and you seem to be there already.

Source please?

I am skinny - if I am not actively swimming in fresh water I am sinking (sea is different but sea comes with waves which is an added complication). If I am tired or nervous then I have to fight with my subconscious to be calm and stay safe. So I would add mental strength to the list for a first time swimmer. And even then I’d say don’t go out of your depth.