Why do We Need Advice?

In all of the teenage magazines that I read, I've noticed that there is always a section for advice of some sort. Whether it's love, family, or whatever else, I've always wondered why they were so common. Why do we need to ask someone else, a complete stranger about what they think on something that you probably know the answer to already. Do we really need a complete stranger to tell us how to live our lives?
Chances are, you probably know the answer already. You probably know what is right for you as your writing the letter to the ask whoever person.
Unless you have no idea on the subject that you are in question about, then in that case, the situation is quite different.
My point of view is to always trust your instinct. If something doesn't seem right to you, chances are it isn't. Sometimes, the answer to any of kind of probelm is staring at you directly in the face, or you can feel it in your gut. My point is somewhere deep inside of you, you probably know what the answer of whatever probelm you have already.
So why do we need someone who does not know anything about us to tell us what we probably already know?
I think we all need to listen to that inner voice of ours. I think society has taught us to ignore it, and therefore adding some kind of pressure to do things, or act a certain way that doesn't fit who we are as a person. Listen to your heart. Chances are, it knows better than any kind of advice columist, or anyone else for that matter. (but if it's medical related, better ask a doctor.)