Hi there,
I'm guessing you're putting them up to protect yourself.. What sort of relationships have you had in the past? Have they been painful? This would, of course, lead to you trying to shield yourself from further hurt.. But there are good people out there, too. You don't need to protect yourself from them

You just have to learn who you can trust. And you can also learn to deal with getting hurt as there are never any guarantees even with people who seem the nicest at first.. But pain is 'just' emotions.. emotions that you accept, feel, and move on from..