Is thinking too much a syndrome of an illness? Perhaps a mental illness?

It has been happening to me. I can think logically in many situations except one... and that is in a relationship.
Why is this so?
Can it be because I am too paranoid?
Can it be because I have experienced too many things and that I have lose confidence in myself?

I really don't wish to be a destroyer...

I really wish to be happy... carefree... don't need to bother about what others think or say.

I really have to change myself, change my thinking... I should...

Labels: my thought