I've often thought of this. I've thought of creating a blog as yeah, I have things to say, but never can quite get over the hump of doing it. So much personal stuff being shared, and I've seen it be used against people later. I could go the route of creating one and then only sharing so much, but one, I think I'd bore the crap out of not only a reader, but myself as well, and two, it would cease to have a reason. What then would be the point? It would start to feel like work to me.
Why bother to do it if I'm not going to be able to really get into it, and for me, that would have to include letting at least 90% of "it" out.
Being unable to quite take that step, I can't help but wonder what allows others to do so or what causes others to be like me and not do so.