If time heals all wounds, then why are people still scared?

i'm not sure as to why I'm writting a blog today. Or why i am at all really, however i felt the need to just vent? Time heals all wounds...I'm not sure as to whether i believe it or not. Yes majority of the pain is gone, well, almost all of the pain is gone. However there is that one fraction, 1% of pain that can consume a person entirely. I guess that's how i can feel sometimes. Like obviously no one likes getting hurt, or hurting others. Unless they're a saddist or a wanker... Whichever floats your boat. I just don't understand as to why people feel the need to be able to be vulnerable to someone? That's all i can't comprehend at the moment. But at the same time, doesn't everyone deserve a chance?
I've based my life around chance, and i guess it can be a good thing, but i believe it can also be a bad thing. How to explain both sides. I'll get back to you, as I, myself havent firgured it out yet. But i guess you could say this is right? && if things aren't, they can be fixed right. Like they say "time heals all wounds", but scars the souls vulnerability to the extent that one day, no one will get in, or nothing will ever go out. Could anyone live with the fact that, that may happen to them? Who is willing to be breakable all for the sake of chance?
To open up is a big thing. Would it be worth it in the end to make a beginning? Let's hope so.