I've noticed a growing trend on this forum with new members having difficulty finding friends. Let's look at the history of how people found friends in the past, then we will look at today.
In the 1800's before cars, telephone and planes there were trains but by and large travelling wasn't done in great distances. People relied only on the immediate town/s for friends and partners. This limited peoples ability to find friends or members of the opposite sex in large numbers, which meant people often married the best available which likely wasn't so compatible in the long run. It didn't matter though as marriage was forever...like it or not.
How times have changed but up until the 1980's the most common way to meet was at dancing. That most common way to meet a future partner was really popular from ballroom to disco. Then dancing became old fashioned...the best way to meet up with someone vanished.
Suddenly we relied on computer dating. In fact imo it is far more efficient than dancing. you can place your profile online, search for similar profiles and sometimes it works- like my daughter and her husband did and what a match it turned out to be.
So I'd recommend that method, what about plain friendships?
Friendships need key ingredients. The glue that binds the friendship is the common factor like a hobby, vintage cars, model airplanes, sewing groups, voluntary work and so on. In fact my ex BIL had no friends and so he took my advice and he joined StJohns first aid organization. For years he has walked the footy grounds among crowds to render first aid, most of his friends are his colleagues now. No different than joining the armed forces (but they have a contract) where you will make friends in fact, some of my friends were in the RAAF like me some 45 years ago.
Not everyone wants to join the ADF even though there are many reasons why I'd recommend it like good pay, adventure, cheap meals and mates. But in general you need that "glue" to meet others or you are guessing on the compatibility.
Do some deep thinking about this "glue". Seek out your interests and pursue that field to meet others. Don't expect to fit in immediately, take your time to suss out the people, to trust some but beware the unsavory and take your time entering into committee membership. Many of us that do have mental illness issues cannot cope with the squabbling and criticism.