I'm not sure I want to "follow my heart"...after all, "the heart is deceitful above all things".
I would say that those who encourage me & inspire me are my mom (ISFJ) and my step-dad (INFP). My mom always offer support/encouragement and sometimes helpful advice, and she can give me the readjustment in perspective I need (so that I don't follow my heart down a bad path). She's a very nurturing person, and she has a lot of faith in what I can accomplish as an individual.
My step-dad is just good at empathizing, and he also offers whatever practical help he can give.
Sometimes my two ENFJ guy friends say the right thing at the right time. They'll give an insight into other people's behavior that is frustrating me, so that I can get over it & do what I need to do.