Is it wrong to not trust anyone?

Apparently, if a person can't trust anyone it means they also can't trust themselves - half of me believes this but then half of me doesn't. I don't trust anyone either and because of it I don't have 'best friends' I just find that I only like a person up to a certain point and then there's a wall I have. You know, in many ways you are right not to trust anyone, simply because I don't believe that any human can be 100% trustworthy, no-one's perfect, including yourself, and it certainly doesn't harm you to think twice before you do trust anyone - saves you getting hurt in the future. What is trust anyway? Everyone's idea and level or trust is different. For me, as soon as I feel uncomfortable about something/someone, I back off from that situation, as in my gut instinct has already told me if I can trust someone or not.