Interesting question. I think everyone has ideas and desires that will never be realized.
I also believe an individual can accomplish most anything they set their mind to accomplishing. "I can't" never could and never will. One has to be confident and believe that they can achieve anything. Goals should be set high so you really have to put effort into reaching them. Goals should also be realistic. If you're 4' tall, your goal should not be to dunk a basketball. If you're tone deaf, a career in singing is probably a bad idea.
There are two kinds of motivation, internal and external. External motivation is out of our control, but we can (and should) strive to become as self-motivated as we can be. One of the best motivations is someone suggesting that you don't have the ability to do something that you know you can do. It's rewarding to prove wrong, those who underestimate you.

I know I won't be able to achieve some of the things I could do, simply because I'm not willing to put the time and energy into making them happen. Other things, require money that I don't have. My strategy is to focus on the important things and do my best to make them happen. I'll deal with less important things, as time permits.
