do you whine at all, perchance? usually whiney people are annoying. thats just one thing to consider though, that might not be it. i personally find them very annoying. um what else, it could be your type of humor. kids who make low iq dirty jokes all the time get annoying. ('derrhurr what does this look like???' yeah, a d*ck, okay). could also be your voice, your voice could just be annoying, or your laugh, or something. maybe youre too nosy, too loud, or talk too much and never know when to shut up.
whatever it is, youre not funny. trying to be funny but failing is just awkward. but that, coupled with those last 2 things makes it annoying. if you were actually funny people wouldnt care if you talked a lot, because it would make them laugh, firing humorous jokes all the time. work on your humor. thatll negate your annoyingness. try saying stuff that are actually witty, that are funny. dont laugh at your own jokes, if you do then at least wait until your audience starts laughing first to laugh with them. do stuff that is light-hearted and fun, and dont try too hard. thats another thing that annoys people. keep it cool, have common sense, dont be a dumbass. its really not hard to not be annoying. be competent. not being an idiot helps, try to become(or at least act) more intelligent.