Is it bad to be a cold person?

When I was younger I was the type of person who wanted to make everyone happy. I would go out my way to do things for others, to the point that I put my dreams and goals to the side. Over the years people took advantage of the fact that I had a good heart. Because of that I have grown colder and bit anti-social. I'll rather spent time with myself lost in my own thoughts. When I am around family and friends I am very social. But outside of that I don't talk much at all. If some one strikes up a conversation I definitely engage but I am not one to start one up. Even when it comes to dating, I really don't care about it anymore. I don't even bother looking at women anymore or respond to their stares and advances. Just need to take time to work on myself. I've wasted my entire life, gifts and dreams on those who didn't appreciate it. What i really want to do is get out this sh*t hole a.k.a New York City and just travel the world. Hopefully to find myself along the way. Unfortunately I have no money to do so.