When Giving All You Have Doesn't Seem To Be Enough

I guess it makes me feel alone. It makes me feel as if no matter what I do there is always a better way of doing it. All of my original ideas that I can get excited about get the steam taken right out from under them as improvements are "suggested" or ideas are offered for "consideration".
Is it just me? Am I only competing against my own assumptions? Or is there an underlying message hidden just beneath the tone of the conversations? What does one do when you are giving all you have, but it never seems to be good enough?