I found it also useful to realize that there are many situations in life where there are just too many unknowns. You're faced with two possible futures: should I go to University A or B? This choice is necessarily going to radically alter your life: depending which university you pick, you'll make different friends, date different people, hang out in different spots, maybe live in different cities. Based on this choice, the life you'll have in 5 years will be completely different. How do you pick which future to choose from, which one is better?
The thing is, you simply have no way to know. What exact future you'll end up with is about as predictable as the weather on this day five years from now. You have no idea who are the people you haven't yet met that are going to change your life, what roadblocks you'll find on the way, whether you'll suddenly fall into a depression, etc. You can only rely on objective metrics (trends, statistics), testimonials, and general gut feeling.
For myself, 3 years ago, after my studies, I was wondering whether I should relocate to silicon valley for a big tech job or not. It was scary. I loved my hometown, had many friends, etc. I figured, however, that I might as well do this sort of experiment (moving to another city/country) while I'm young and have no spouse or property. I did make the move, and unfortunately, I didn't enjoy my big tech job, nor did I enjoy living in silicon valley, it wasn't a good experience, so I moved back, thankfully with a decent wad of cash to wipe my tears with.
I didn't like silicon valley, but I don't regret my decision to try it. Why, because I also knew that I kind of had to try it, because if I didn't, there might always be some FOMO in the back of my mind (what if I'd taken this big silicon valley job, would my live be better right now?). Now I've done it, I've been there, and I know what it's like. The pressure/temptation is gone. So my two cents are to trust your gut, do commit to decisions, and also don't be overly afraid of experimenting when you're young: it might not work out, but you'll learn something along the way.