Karl Marx, The creator of Marxism aka Communism had the same idea as you. There would be no violence, no jealousy, and no way to harm another in any form or fashion.
However, communism failed terribly. The only properly functioning communist country today is China, and they still fail to meet ends on human rights.
There can't be a utopia, it's utterly impossible. Unless you completely manipulate every aspect of every life for the rest of mankind, there's no way you can reach the state of utopia.