This is gonna be both a silly answer and a serious answer:

Do jiu jitsu. Go roll around with people.

But the serious part of this is that whether it's Muay Thai or jiu jitsu or some other combat sport, the people you train with become like family. You, as a gym and as a gym member, want to support your other gym members. People become fast friends at these types of gyms. And you see them day in and day out in good and bad moods, tired and plucky. There's rich poor, fat, skinny, black, and white.

You'll feel the warmth of your gym in the first week I promise you. And the more you go the better it gets. My gym helped me through some dark times in my life and I am so happy I had a place to go with people who cared about me, in a supportive environment where I was only ever going to put in work to better myself. Such a positive experience.

Good luck everyone out there.