You are more funny, because you are more relaxed and have more control and time to think online. In order to be funny irl, you just need to be more relaxed, and practice, practice, practice. As you practice, things become easier, and you need to think less, it just comes naturally to you.

Besides, if people get used to think of you as a funny guy, you'll get them laughing with little effort, it's as if they were already chuckling just by your presence.

Practice!