Body language is a very important aspect. Regarding your behaviour, there are people who take body languages very serious. However, the truth is body language can actually affect the person in front of you psychologically. For example, you may not intend to say negative things, however, because of the position of your legs or arms, the person in front of you may understand different thing psychologically.
You may want to learn more about the body languages to behave and be careful about it. Also, you may want to learn it, so you can understand the mood of other people when talking.
