What do you mean people sound like robots when you talk to them?
Maybe you're trying to probe them too hard, or approaching them in an overbearing manner? People don't want to just open up to anyone, they want a reason. They want to find a connection, they need you to give them something they can relate to and don't want to feel like their personality is going to be drowned out in yours.
Or maybe you're just getting too bored with them before you get to know anyone and just dismissing them as boring people, as "robots", before they even have a chance to open up?
I'd agree that a lot of people do sound like 'robots' a lot of the time, but everyone has a unique life and there are many with truly interesting stories. And all you have to do is give them a chance, a real chance. I'm not sure what you're doing now but if you're calling them "robots" then maybe you're just not actually giving them that chance.
Or maybe it's just the people you're talking to, and you're just running into the real 'robots'. Maybe it's time to branch out more.
I can't tell you specifically what is going on, so maybe take a little while to reflect on yourself. Think about what you're like when you talk to people, put yourself in their shoes, and maybe you'll figure out the solution. And if not? You can always come back here and tell us what you've discovered so we can help you better.