It sounds like you realize what's going on with you. Can you go to your doctor and tell him or her about this? It would be good if you could see a psychotherapist to talk about this. You need someone who has studied about paranoia and knows how to help you deal with it and to help you get rid of it or at least to make it not so strong.

This online community is a good place to help you not feel alone with your problems. If you read, you will see that many people have similar problems.

I hope that you can find help.