Plan a holiday to the US, look things over and then make a budget (emigration is far from cheap), save and then decide to back out or bite the bullet. Don't do anything permanent until your visa is in the bag for you, your spouse and your child. Hollywood and anecdotes are not good inputs to a life determining decision like this, consider it a huge project and devote resources accordingly.
Why is Belgium disappointing you?
The US is definitely not paradise but it may give you chances that are hard to replicate elsewhere. At the same time, I know plenty of people that are successful in the EU. It usually boils down to the people, not the place.