I feel like a psychopath when I have one speck of doubt.
Why does doubt cause you to feel like a psychopath?
Because I'm having trouble trusting my girlfriend again
Sometimes relationships experience situations that cause us to be distrustful of them. However, not trusting a partner does not make you a psychopath. Instead of thinking this about yourself, you should communicate with your girlfriend about how your trust issues with her are affecting you.
How would that look? I'm supposed to be a secure person with no issues. I'd hate to talk about it with her.
You just have to swallow that pride and get on with it. The only way to your freedom of thinking bad about yourself is to be human and try to work things out like a normal person would.