The key to learning as fast as children should simply be to act, in certain situations, in the same way that they act: for example, the spontaneity in speaking what comes to their heads. Good will to make mistakes means being prepared to put yourself in embarrassing situations. This can give damn fear, but it is the only way to develop and progress. If you enroll in a Polish course, help in this process because you will meet other people with the same difficulties as you, there are great schools that offer – learn polish.
The idea that children learn better than adults has proven to be just a myth. New research could not find a direct link between age and ability to learn. We learn by mistake. In the case of children it is expected that they make some mistakes, and in the case of adults, this seems to be a taboo. Learning a language by admitting that you do not know everything (and that this is not a problem) is the key to developing and being free. So let go of your inhibitions of the adult world.
No matter how much you learn, you will not be able to speak a language without showing yourself: talk to natives, ask for directions, ask for food in the restaurant, try to tell a joke. The more times you do this, the more you will leave your comfort zone and it will be much easier if you do well in new situations.
The important thing is not to be afraid, even if you encounter some of these difficulties:
Construction of sentences and syntax,
Speaking and make mistakes is the most natural and efficient way to acquire vocabulary and assimilate the constructions of a foreign language.