If you don't trust your psychiatrist, why should you trust me?
Still, I am gonna say a couple things.
Did your friends reject you - or did you reject them?
A lot of the time we push people away, without even realizing we are doing it until it is too late, especially after something bad happens. It almost seems like we like to punish ourselves further by cocooning ourselves from risk of more harm.
It is something you see a lot in the army, when someone is injured, sometimes when someone kills. They try to withdraw into themselves. In the army, they are not permitted to do that, it is actual policy to prevent it happening and part of the treatment.
If you don't want to make new friends, why are you mourning your formerly active social life?
You didn't think of it that way, did you now. Part of you wants the old you back. You'd not have asked otherwise.
Why are you jaded?
You are not jaded. You are numb. Big difference.
You know full well what my words of wisdom will be.
People are social creatures. We like being around others who we like and trust. We also need to be around others sometimes. It is a basic human drive, and why solitary confinement is considered a harsh, almost too cruel, punishment. You have put yourself in solitary.
The door isn't locked. You can open it at any time and walk out into the world again. Sure, it is scary. It'll get harder to do, the longer you leave it. So make the effort. Get out and get talking to people. Maybe join a club. No excuses.
When was the last time you laughed?