Well, that is it in a nutshell. We just do not know how anything will go, or be, unless we try it, first. You see, our mind has a wonderful and very colorful mechanism of protecting us from new experiences because it wants us to stay safe and survive. Anything new is often filed under a big no. This is why we talk ourselves out of trying things that happen to be new experiences.
One amazing thing I have learned is that we have no idea whatsoever how the new experience will really make us feel. Sometimes you think hiking for an hour will suck, but you end up loving it. Sometimes going out to jam with new musicians feels very akward when you are home thinking about it, yet it proves to be one of your favorite experiences, ever.
This also goes towards people. Some of the people I did not really like from afar turned out to very cool people after all. And, the opposite proved true many times as well.
In the end, I just want you to consider that experiencing something is so much different than listening to your own voice of how things will be.