Let me tell you a little story about how I followed my heart.
First let us be clear on what it means to follow one's heart. To me it means doing what one feels to be "right" and rings most true with one's self. Naturally no one can tell you what your heart is saying other than yourself, you are the only one who can hear it speak clearly. To follow it, then, is the only way to let your heart, or your soul, speak to others.
I grew up in a loving environment that never the less placed an excess of emphasis on being "likable" one of my parents had been popular in school, the other had not. The one who had been popular nurtured what was natural. The one who had not suppressed what was less than stellar. Parts of me thrived in this environment, parts of me were suppressed and repressed quite rigorously. Eventually I left home making predictably poor choices in an effort to be the most acceptable person I could be. Within a few years I had lost all touch with myself and become a caricature of what I could have been. A few more years of this saw me at my most apathetic and cynical the things I had cared for and championed as a naive youth were ridiculed with all the cruel hate of disappointed dreams. I with drew from the few friends I had left, even as I withdrew from myself.
Whilst marching resolutely down this road to hell, an angel passed my way and asked me where I was going.
"Hell." I blithely replied.
"What a coincidence, so am I. I'll walk with you."
As we walked we talked and eventually he dissuaded me from seeking utter destruction simply because that was the direction I was going at the time. Why I could turn around and walk to Heaven just as easily as I was walking to Hell. Couldn't I?
I began to hope again. Pulling the splinters of my shattered dreams from the festering wounds in my soul I began not only to heal, but to put them back together. Some are broken beyond repair. Others are not.
I dream of one day writing something I would not be ashamed to have on my bookshelf for anyone to take down and read. So I decided to stop letting my dyslexia stand between me and story telling. Since making that decision I have doubled the number of words I spell correctly the first time and quartered the number of words I argue with spell check to become recognizable.
My Angel, upon learning I love to sing, and hearing my dulcet (though very rusty) tones, gave me a mic and helped me to develop the confidence to unlock my voice once more and share the love of music that is my souls delight with those who would hear it. Once again I can open my heart to the world through song.
Why should you listen to your heart? Because it is the only voice that will know you best of everyone. Because it is who you really are.
Why should you follow your hearts advice? Because you are the only person who can be you.
Of course its going to be hard. Naturally there will be obstacles that make you want to scream to the heavens "WTF! I thought you were on my side!" These things are not there to defeat you, they are there as a check and balance. If you can over come them you are ready to grow in new and exciting ways. If you cannot you may chose to wallow in stagnation or strive to grow stronger, braver, wiser... what ever it is that is lacking that prevents over coming it.
I'm inclined to be harsh in my answer, so I prefaced it with a story, so you could understand where I'm coming from when I rap your knuckles and say "Because anything less is a gross betrayal of your eternal soul."