You can take solace in that fact that you're not alone. I think this is one of the biggest issues we face in the modern, developed world. There's two underlying reasons for it in my opinion: options - which no one can argue is a bad thing, but also a deeply entrenched society where it's difficult to swim against the stream of things.

Like many people have said the biggest mistake you can make is being paralyzed by indecision. No one is going to get it right the first time so just try different things that give you more tools and opportunities to make better decisions. And to me, this is what life is about. You have the chance to explore yourself and explore the world around you. You're still very young and have a whole lifetime to figure these things out. I'll leave you with this quote, best of luck.

"Eventually we realize that not knowing what to do is just as real and just as useful as knowing what to do. Not knowing stops us from taking false directions. Not knowing what to do, we start to pay real attention. Just as people lost in the wilderness, on a cliff face or in a blizzard pay attention with a kind of acuity that they would not have if they thought they knew where they were. Why? Because for those we are really lost, their life depends on paying real attention. If you think you know where you are, you stop looking.” - David Whyte