So you want to be a... anything!
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Well, I am certainly not the only one to have come up with this idea: Dr. Michio Kaku wrote an article about becoming a physicist. Well, he basically tells you you cannot become a physicist if you've already lost the train. But I disagree. If you really want something, you can achieve it, at any age, only you can't do it with support from others.
So, what do I want to become? I've written in my todo list to check out calculus, topology and noncommutative geometry. That is almost certain not to go well, but at least I plan to try (trying). Damn, I like to think of stuff and never do anything about it. I only like whinning more! But the question is: what do you want to become? Don't waste your time. And I am not talking about carrers, I am talking about the things that makes one define himself on. Like for me, I am a C# programmer. That defines me at this moment. I certainly am glad there is more to add to that, like other achievements or "I am a good person" or "I have felt true love", but I still wish I could add more. Maybe being a part time garage cosmologist wouldn't hurt. Dreams ARE important and they are surely unachievable only when you don't even try to achieve them.