You should go a bit deeper into the issue to find out why you act like you do. Do you not find the conversations you have interesting, so you don't bother? Is it because you're worried about doing something wrong? You don't want to centre attention on yourself?
Shyness or unsociability is often something that has a cause. You learned to behave that way for some reason or another. If you want to, there's always the option to behave differently.