Can you tell me what's wrong with me?

I always fill like people are out to get me. Like use me, walk all over me, etc. I have so many trust issues. It's the same way with family. Although, everyone tells me that they love me and would never do anything to cause me pain in any sort of way. I just feel so insecure being myself. I'm always nervous, paranoid and irritated by everything. I could be having fun, but at the same time I'm thinking that something bad may be heading my way. I'm somewhat frigid and tense in groups or crowds. I never get good sleep because of the stress and insomnia. I also have this habit of grinding my fingers together when I'm around people. What's up with me?