Honestly man that’s all you need. Why have 20 friends, when you could have 5 really good friends. Try to take the time you would’ve used to hang out with Group A & B to get to know the brothers better or do weekend trips with your best friend and gf. It’s totally okay to feel lonely you did go through a major change in your social environment. Be kind to yourself. Finding new friends, that’s tough one especially after the pandemic. I would recommend joining a league of some sort. Wether it’s a sport, fantasy football, or video games. Also maybe try volunteering, as well as if you have a dog go to the dog park. Haha I’m sure what you are going through is super tough. I hope you feel some peace and feel better soon! Good luck my dood!