When my younger child left home, Msida and I downsized to a new area, it was just me, a new job and the cats. I worried about not talking to anyone all day at weekends and holiday time, so I didn't buy in a lot of cat food then. If there was nothing in the cupboard to eat, I could always go hungry, but I'd never let the cats go hungry. I became on good terms with people in the shop round the corner, and I knew I'd always get a smile and a short chat when I went in there, a wave when I went past.
When I retired, I got a dog. Same idea, get out every day, a chat and a wave, a 'good morning' gets me through a quiet day.
As regards to hobbies, I do crafts I gave up when the kids came along, I've learnt new skills. If you have a look at U3A sites in your county (not just your immediate area), you'll find so many different pastimes - walking, book clubs, family history, photography, every craft imaginable, choirs, languages, scirnde, Sunday lunching, cards, Scrabble - sorry, you must be dozing off! Have a look, something will appeal.
Lastly, if I can do an art class, anyone can. Don't let lack of talent or expertise hold you back.
Good luck