How Does the Brain Work?

I'm a little unclear about it. I know that there is a part of the brain where memories are stored and where you solve problems and that information is transmitted via neurons, which send some kind of chemical signals (I'm just 15…). But what calls the right memories to answer a problem you are facing in life?

Suggestion:

I think that when there is a problem in your life, it is 'you', or your subconscious that will answer a problem 'using' the brain. I know there is a scientific explanation for this, but I believe it works this way.