First off, I just want to say that this is my opinion on dreams. Don't agree with me? I don't care Dreams as in goals, not dreams when you sleep.
You know how people all have something they're interested in, or something they want to do when they grow up? I think that's what we were meant to do. I think before we were born, we had our own paths set up. Not set in stone though, more like a guide line. Now, it's something like "I really want to be this, but I can't because I was chosen to be that." It's more like a positive thing. Say you're path was engineering. As you grow up you'll find that engineering is interesting to you, that you like it. That would be what you were destined to do. Think about it, it makes sense doesn't it? I think it does. I'm not saying it's like some big force in your life, it's simply inevitable. It's what you want to do that you were meant to do. It's nothing at all like a burden. For me, I'm leaning towards being a teacher. Unfortunately it'd be hard to find a job if I were to be a teacher, but that's besides the point...
I'd be more descriptive, but not everyone on this site... well, this site has very diverse beliefs. I'll leave it there.