I'm afraid to be intimate with anyone
What makes you so afraid to let people in?
There was a person who hurt me very badly and I want to stay away from anyone like that
I hear you, and I understand where you are coming from. It is alright to want to protect yourself, but you should also try and be open to new relationships, since otherwise you might stay stuck in the past and never move on.
How can I open myself up when everyone is bad?
Not everyone is bad and you have to have trust before you can let them in. It's good to want to protect yourself, but you can't always keep people out. You have to be willing to trust yourself and let people in just a bit.