I'm going to try to jump in on a conversation
What makes you think they want you to jump in?
I have had a history of it working before
It is rude to butt into a conversation just to make noise. You should respect other people and maybe raise your hand so they know.
I think I am going to do it anyway. It just seems like the right decision right now.
Well it's still rude and you should just not do it. They may get a little angry with you.