Tales of a Secret Rockstar

So I went out last night around 12:30, found a quiet (and dark) place to sit, and watched the stars. They were so beautiful. But really I was just more happy to be alone and have some space to think. My trains of thought tend to easily derail. I bet no one could see that terrible metaphor coming. Anyways, It was so clear and cold and nice outside and I got to think. Thinking is one of my favourite things to do. Sometimes I think out loud, just for a change. But usually my thinking is done internally.
In my thinking I came to a somewhat disheartening realization. It's something that I've been starting to notice, but under the stars last night it just seemed to come into a sharper clarity. I realized that I am absolutely terrible at letting people in to my life. In fact, I don't let people in to my life. I don't tell people how I feel or what I'm thinking. I don't even really tell my parents what I'm thinking most of the time. And I don't really let God in to my life. I mean, I give him a certain amount of space, but beyond that I don't let anyone in. I realized that I need to start opening up, at least to God, or I'll most likely die.
So it seems I must start again. It's like I have to learn relationships all over again.
Is it wrong to be scared of letting people in?
I feel like I've been hurt way too many times to even be myself anymore.
The world doesn't have much of a place for those that are truly vulnerable.