What matters is you understand and mistakes happen because you try and the best way to learn anything is by trying so just do not get tired nor dismayed continue to seek help or kindly ask them how to say it properly. In time since nothing great just happens overnight you will be progressing in speaking English. Just bear in mind that even native English speakers have opportunities in Grammar so carry on and just be more eager to learn, speak more and take the corrections constructively.

Because listening takes less effort than speaking. In other words, speaking is the active part of the language, while listening is the passive part of the language. By the way: "Why is my listening always better than my speaking?" Please correct your question title.

Yes, me too. I also make many grammar mistakes when I talk. :(