What if I lack a sense of humor?

Most people who feel the same way will answer this question. Boys are ok, especially when I am with girls. You always say something serious. What a damage it is! However, I want to find some humor, but I can't find it; Even if we can find it, it's not so natural to say it from our mouths, alas! I think the most important thing is that we have no self-confidence and will not speak what we want to express confidently. In fact, we all have humor genes, depending on how we play.