head -vs- heart

I think that may be the biggest fight of life. What should you listen to when it really comes down to it....your head? or your heart? Surely there must be a middle ground between the two but I'm pretty sure that would be your nose or your mouth so it would just end up with me smelling and eating everything so that's no good. But seriously, when it comes down to the hard things it's difficult to know which way to go. Countless songs and quotes tell you to listen to your heart, be true to your heart, follow your heart...etc. Then there's other songs and quotes to the opposite affect. Use your head, think things through...etc. Maybe you're just supposed to do both, depending on the situation and which one is applicable. You would think that at 22 years old I would have this stuff figured out. If only life got easier with time, instead it just gets harder, more complicated, and more frustrating.