I certainly don't think paranoia has to equal psychosis. Depression and mania both affect our thinking at various levels of severity. As does anxiety. Have you talked to your therapist and psychiatrist about this? It might be good to have them help you investigate it. Cognitive Behavioral Therapy (CBT), has a focus on challenging cognitive distortions that is perfect for such an issue.

You certainly might be totally wrong about your colleagues. Or if you're right to a degree, maybe they may have concern about you more than hate.