1: Don't follow your heart.
This is a tough one in your worldview. I've read many times that you NEED to follow your heart. This may be the worst advice you can make yourself believe. It can be very destructive. Following your heart is based on a worldly notion that the heart is trustworthy. Whenever I see "just follow your heart," I want to pull out my hair...that I don't have. What that's really saying is that you should just "go with whatever is convenient, comfortable or feels good. Your heart can't be wrong!" Moments like that can really screw up one's life. Imagine if I would have "gone with my heart" when I met you. I'd be in a false religion. Thankfully, I had enough sense back then, not much but some, to realize my heart doesn't always have my best interest in mind. Here's the truth, the human heart is evil. (The human heart is the most deceitful of all things and desperately wicked. Who really knows how bad it is? Jer. 17:9)
This is very unpopular today, I get it. "Do what you want! You can be whatever you can dream! Follow your heart! etc etc." You see these tropes everywhere because who are we to judge? You can tell a kid to follow his heart to be an astronaut but if he's terrible at math, he will never be one.
You cannot depend on your heart (James 1:14), not when emotions are involved, your heart is always changing, your mind and even preferences are always in a state of flux. It can lead you into terrible relationships, bad financial decisions and like above, a complete waste of time following a dream job that can never be.
Instead, GUARD your heart. Learn how to make wise decisions. The scriptures tell us that God's wisdom is greater than our hearts (1 John 3:20). He promised to give wisdom to those who ask (James 1:5) and he gave us the Bible to guide us (1 Timothy 3:16). You're not gonna understand everything, but wisdom comes with some study and patience. Your heart isn't always wrong, but when it contradicts truth, you're in for some hurt. Don't follow your heart, follow the TRUTH.
I know following your heart is a big part of your worldview now, but give the scriptures a chance. It is a guide for us on earth, it's steady and doesn't change--people hate that. It doesn't need you making things up as you go, looking for signs, it's just there, you don't have to follow your heart. And if you ask for guidance, you will get it.
"If you will fear the LORD and serve him and obey his voice and not rebel against the commandment of the LORD, and if ... you will follow the LORD your God, it will be well" (1 Samuel 12:14).
“People almost invariably arrive at their beliefs not on the basis of proof but on the basis of what they find attractive.” -Blaise Pascal
"Most people are on a happiness quest, not a truth quest." -Dr. Frank Turek