I had a similar experience but now I am alot better. It has to do with stress and a betrayal type of thing. Has someone done something to you in the past that makes you insecure now? Have you done something in the past that you deeply regret? Once you find out what it is, you should forgive and learn from the lesson. Whether it was your fault or anothers, forgiveness is always healing.
Please listen to this song by,
India , Arie- Wings Of Forgiveness
( Listen to it like its speaking to yourself.)
Ive realized that people that suffer from a type of paranoia or anxiety are very kind and compassionate people. You should notice this about yourself and see that you can become a much greater person.
You should really work on something you are interested that progresses and which would be constructive. Remember, NASA started with a philosophy (first steps), science started with a philosophy (first steps), we do everything from philosophy..., what I mean is that if you put your visions into practice, that is how EVERYTHING came to be since man kind existed. A journey starts with the first step. Take that first step of forgiveness and if you dont need to forgive then take the first step to say that you deserve to not be insecure. We are all people with the same wants and needs, why do you have to suffer?
Sorry for the rant but I know how being paranoid feels.
"When the rain and clouds pass us by, the most beautiful sunshine always follows."