Some religion teaches the eradication of wanting because it causes suffering when you don't get what you want. Of course it causes suffering when you don't get what you want but I see it a little more like counting your chicks before they hatch (or counting the apples in a seed).
It's easy to give up and go back to the comfort zone where we don't have what we want. As a matter of fact, I guarantee you are going to live the rest of your life in a state of not having what you want because as human beings, we are always wanting more. We are farmers, perpetually planting seeds, we are creators, always with a paintbrush in our hands and hunters, always in search of the next thing.
Ceasing to want and being wishy-washy about desire is the beginning of death, or depression. Everything you do in your life contributes to you thriving or to you dying so giving up on your dreams or not having them for fear of not achieving them is another penny in the death bank.
Life is like the most wonderful buffet (sorry about the constant food metaphors!) where everything is really fresh and yummy, it doesn't matter what you pick (what decision you make) because you can try everything you want and you can eat it all (that's what all-you-can-eat means) but not all at the same moment. However, if you stand there long enough, not deciding, the food will perish, go bad, start to decompose and won't be as delicious anymore. You get the point.
Decide. Set your eyes on the prize and then take the steps to go there or at least keep heading in that direction. Yes, it's OK to be flexible and evolve your desires as you keep those eyes on the prize (like a dash of soy sauce or picking out those unidentified crunchy things) as a matter of fact, it's essential. Decide, stay flexible and go. If your dreams get modified, make sure they are bigger and better. If you only get delivered mediocre, you simply are not there yet.
I'm sure you've already got a repertoire of stories of how you got exactly what you wanted or better when you didn't lose focus or let other people's desire for you sway your own. For every one you share, I'll share one with you!