How do adults make friends?

Hey guys I am a 22 year-old mum of a two-year-old boy and I have not had a friend since 2019 and most people think surely like that’s not possible of course you’ve had someone everyone’s got someone but I’ve genuinely have no friends, no want to talk to no one to meet with or vent to and it’s so draining and heartbreaking honestly I’ve tried to make friends with this app on Facebook and everything else I’m not sure if it’s just really hard as adults or it’s just me personally.