Words of an ailurophile

Now I might sound a little paranoid, but a thought - a feeling - suddenly stuck me.. I couldn't help but feel at everyone is always just pretending. No matter what. If they try to be nice, polite, have interest, love, be an arrogant dick, self-confidence, all that ... Just a pretend... because you have to.

Because really, you can't really tell for sure... You don't know what people are thinking or feeling, and I bet they themselves probably don't know for sure either.... We do so many things automatic..
I even wonder if my cat just pretends to be interested in my company...

Somehow I feel I can never really trust anyone for sure, because of the simple fact that I don't know what they really are thinking. They could be lying to me when they tell me they care, or they like me...
But why is it exactly that I should care about this?
If I was reading this, I would probably just tell myself that the odds of someone thinking something bad rather than good isn't necessarily always bigger. It goes both ways, and I believe people often think good things about people without really expressing it...
But what does it matter, if they never tell? Its funny that way actually... Why is it that when someone thinks good, but never tells, its of no important value, but when someone thinks bad, but never tells, its the end of the world?

I'm just being paranoid... Thats just it.. Nothing serious. It happens.
But I just have a really disgusting feeling that some people really dislike me, and I'm not welcome in their company... I know I only make it worse with my own paranoia, but how can I help it if no one ever give me any evidence that I'm wrong?