Am I being to unrealistic on life, or am I just a positive person?

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I have this outlook on life of what I want to do. The main thing is become a Registered Nurse. I want to become a Travel Nurse. I want to experience new places, people, and help them out. To see if I like it or not, after I finish, I would love to volunteer for PeaceCorp and go to Africa to help out for a couple of months If it goes well, then I'll try and get a job as a Travel Nurse. I want to keep studying for other things though afterwards if I can (I believe I can) Doesn't matter if it's online or go to school once a week. And maybe, just one day, I want to write a book (I love writing) I want to feed my mind and soul with new things. I want to look back at my life and see that I actually did something great for others and for myself. But when I tell people, it's like if a five year old is telling them,"I want to be an astronaut". So, I will ask all of yous, as I can see that there are many on Mylot, if I'm being too unrealistic? I truly believe I can succeed in life. Yes, I know there will be tough times, but I have hope and faith. I have a positive outlook on my life. So am I being positive, or just plain unrealistic? Thank you for your opinions. You don't know how much I appreciate getting more thoughts on others from all around the world, rather than just one person. Who, most likely, is probably closed minded :P