How to stop being annoying?

I'm Annoying and I know. I'm loud, I talk to much. I original and am so hyperactive. People get annoyed with me so quickly and although I try to hide it, it does hurt whenever someone interrupts my conversation to talk to someone else or ignores me or bluntly say 'Shut Up!'. I try not to be so annoying and I do let other people talk. I try to be liked, I'm not pretty so my personality is the only thing I have going for me. I don't have a best friend and I wish I did. I talk really fast and have a problem explaining things. That means I end up saying three times as much as I need to and its hard to understand. How can I stop irritating people?