I've learned in my life that it's important to be able to step outside your comfort zone and be challenged with something you're not familiar with. That challenge will allow you to see what you can do and this is the only way you can grow.
Skydiving is only one example. I went to Hawaii two years ago after I found out that my husband had an affair with one of his colleagues. I have just got married at that time, exactly two months before I found out that he cheated on my. So as soon as I found it out, I bought a flight ticket to Hawaii to enjoy my life instead of staying at home and crying in my room. I decided to do EVERYTHING in Hawaii that is out of my comfort zone. And I really did :)
Beyond skydiving, I jumped off cliffs, which I've always been afraid of, and they were quite high, as well (approx 8 meters). I was more afraid to do that than jumping out of the plane :D I was extremely proud of myself after I did it!
Right after I got back to Hungary from Hawaii, I decided to participate in the Spartan Race, which is one of the toughest obstacle race in the world. I ran 21 k in the mountains in crazy muddy circumstances and did 25 obstacles during the race. It was crazy, I really pushed myself beyond my limits, but I loved it!
I would be a totally different person without these experiences.