Probably smart to talk to a therapist, but also gardening allows you to focus your care on something else than yourself (which paradoxically helps you), that in return gives you a place to be and food to eat - maybe take a look into urban gardening

That feeling of loneliness is not going to leave you, and any negative emotion is not your friend, no matter how it convinces you - instead it will bleed you dry, and leave you alone once you are dead - the only thing you can do is to leave it first. So drop the emotion, move on, and once it comes back you do it again.