I think if you try to be something, then it doesn't work. If you try to be funny about everything, it doesn't come out right. If you just comment when something naturally pops in your head it's genuine and usually funny. Just be yourself. If some people think you are boring, hang out with different people that you have more things in common with. It gives you things to talk about that everyone is interested in. These friends are less likely to find you boring and you are more likely to have fun with them.