>whenever im talking to a girl im interested in (or any girl, really), something is always telling me "she hates you, you have no chance,just leave"
That's how I use to feel around guys until I realized that they're opinion of me doesn't matter.
Stop thinking that every girl you meet is girlfriend material, some people are better as friends.
And if you can't pick up on signs, ask a friend who is good with ladies to ask if a girl likes you to make sure.