Don't try so hard to be funny.
I make people laugh by saying things that come naturally to me. Doing this has landed me with no known enemies, lots of friends, and I get compliments on how people think I'm funny all the time.
If you try so hard to be funny it will not work. In fact, it will do the opposite and people will think you are annoying. If something comes naturally to you that you think is funny, say it. If nothing comes to you, just don't say anything. Trust me, it will make people enjoy your company allot more.