Why do I always find myself in such situations ?

last day i realised i was chatting too much... I talk to people i don't even know about me, my life etc... why this need to always share everything even with complete strangers ? sometimes i just felt there were positive vibrations with someone, but unfortunately the person in front of me's not always feeling the same...
and something even more pessimistic : i'm going out with someone with whom I definitely don't feel good vibrations and the will to talk.. To sum up : sometimes we're just facing each other with nothing at all to say, or at least just casualties.
so what's my problem ??