Unpacking Baggage

I don't know what I have to do, in order to get over all the baggage left from the crap growing up.  It's a lot easier to say that you completely trust someone, but it doesn't mean that saying it makes all the doubt go away.  I would love to just openly trust those I like, but i just can't stop questioning.  I dwell, and that doesn't help anything either.  How am I supposed to unpack the baggage that I've been lugging around since I can remember?  How do I stop the doubts, the questions, and put my faith in someone again?