Nevermind the naysayers and never wait for others to validate your dreams. Go and do, and never look back. For they are behind you for a reason.
Find happiness in the little things. For they will get you through the big things.
I've heard this before, but I think it's worth repeating. "Never confuse your means with your meaning." Enough said.
Surely, if He whispered in our ears, what we're supposed to be doing, we'd go and do without hesitation. But that's not how it works. Instead, pay close attention to your feelings. They are the barometer, guided direction for us. Notice how when things are going wrong or you're sad and you keep going down the same path, things only get worse. Adversely, when you're doing what you're supposed to, what's right, you're somehow inclined to continue forward. Well, that's Him, telling you that you're on the right path, or to quickly make a u-turn. For all the signs keep popping up, but will you heed them, or ignore them. Don't confuse the speed bumps with stop signs and dead ends.
I'm a writer. Not because I have sold millions of copies of my books. I'm a writer because that's what I dream about and what I wake up thinking about. It's what makes me happy.