I'm 21 now trying to plan out my life and this is one of the major things for me. What do I want to do in life that is important to me and can I accomplish this within the timeframe I have. I don't have a second chance so I don't want to spend time doing something that I'll lose interest in, or end up being stagnant in some job that I can barely stand. I'd rather do all that worrying now then when it could mean finishing something on time. At least now I can plan accordingly (do this before I'm x years old) to how much time I've wasted, instead of wasting time and not accomplishing a part of it before I need to.
Also trying to figure out how "great" I am, or what I am "great" at. So I'm not disappointed at myself . I've already gone through that once on several levels when I went from being an old teenager to a young adult. One time is enough, and I bet it's so much worse when you're at the point where you can't accomplish the goal because you're not good enough (or even just questioning if its feasible, that has to drop you farther than where you should be and end up doing worse because of it.)
Or I may be just wasting time now and I should just jump in. I don't know, maybe I'll figure that out. I don't need much in life, just to feel like I've done the best that I can at whatever I end up choosing. Not even in an idealistic way really, I want to give back what people have given to me (knowledge, ideas, materialistic things if any) so at most I don't leave the world knowing that I did less than nothing. If I leave doing more than I have taken then I can be happy in the fact that I've made the world a little bit better. Not a lot but it wasn't a waste being alive.
Maybe I should just get a job.