Welcome
@Jami1488 !
It's probably not very similar to your case... But in my case, I often feel "detached" from other people and I avoid establishing connections or friendships with them. At the same time, I actually want to make friends and have relationships with people, but it's difficult to do it and usually I need a lot of time to actually start feeling comfortable and close to someone. And even then I still suffer sometimes from trust issues and I often doubt what other people actually think about me. But that usually comes in cycles, so I feel much better and confident after some time.
I came to a conclusion that I have to put some extra effort into trying to establish connections with other people, and also some effort to maintain them. Usually if you're "closed" to some extent, people just don't make an effort to get to know you better; albeit there are some exceptions... But those are that - just some exceptions.
I don't know what exactly causes you to push other people away. Maybe you should start trying to figure it out. Maybe a therapist can help with this?
But, I think once you'll figure it out, you may be able to overcome this urge to cut other people out of your life. It may require a lot of effort, but that's just unavoidable for people with PTSD and similar conditions... It seems like a lot of those things are more difficult for us.
I think it's really worth it to maintain relationships with people. Personally I found that when I'm able to talk profoundly with someone, it has therapeutic effects on me. So I try to do it more often.
It's still difficult for me to reach that point, but it's better now than it was 5 years ago...