How to Stop Interrupting People

I get interrupted all the time. Whether I'm telling a long-winded story or just trying to finish a sentence. It seems like people have no problem just talking over me before I've made my point. This is going to be impossible to edit. Don't edit. Why would you edit this? This is all been gold. How to get my friends to STF you for like a second without sounding like a complete dick constantly cut off in Colorado.