Your best bet is to pick a hobby you’re interested in that forces you to interact with people. Some examples are taking a 6 month language course for a country you’d like to visit, or joining a martial arts club, or painting, or yoga - anything to get you out of the house regularly. If it involves nature you get bonus points (hiking , walking, surfing), because it does your mental state a world of good. Any of those clubs are likely to lead to after-club drinks or coffee or lunch where you can make new friends. Exercise is great for the mind too - you’ll feel much better if you’re getting fitter. Any of this will gradually lift your spirits snd improve your confidence, and you’ll not need to rely on your family as much - it sounds like it’s time to begin a new chapter. Since you’ve got a dog, see if there’s any group doggo walks that end in at a pub or cafe.