I read a good quote regarding this one.

Your friends are a reflection of your own personality. Intelligent people tend to have less friends that the average person.
The smarter you are, the more selective you become.

I wonder this too. Why can't I make friends or keep them... Why can't I believe that people care...

I sometimes wonder if abuse damaged my brain.

I, literally, do nothing socially....in spite of other people continually try in include me.
For example, my job is throwing me a birthday party this weekend...am I going???
No.

You could be but it'll cost you maybe £500-1k to find out.

Sometimes it's better to just figure out what it is that's causing you problems and try and work on them. If noone is prepared to give you feedback, maybe you can watch someone like Vanessa van Edwards.
She's an orator but has lots of tips and tricks to help people be more appealing socially.

Everybody is a unique individual with a different personality and various personality traits. Sincerity and honesty are the reflection of good hearted people.

Don’t be ashamed of who you are or bothered by the fact you are not like others. Be yourself, it is enough. Just be you…..

I'm the same
For me it's just ....I'm tired ...from work ...family ...I'm too tired to be bothered to have any kind of social life ...plus I find most people highly irritating

or maybe you just have taste

Could be.

Me:

Or maybe you’re just shy and inexperienced at making friends and maintaining friendships. Some people are better at it than others

You can be tested.

You wouldn't be the oldest to be diagnosed positive