Help with my nipple please : Mens Health?

Well ever since I've started to work out on my pecs ( they got big see my pic ) my nipples have gotten more pointy and the actual nipple seems to go out amd it pisses me of cos I got sensitive nipples and if someone touches it its that sensitive I'm going to be swinging like a loony anyway I'm 15 year old boy and I hear it could be to do with hormones or something. Does anyone know what it is and when it will go. I'm thinking of commiting suicide over this hahahahahahaha not I'm not really sorry that was a bad joke :( Anyway 10 points for best answer its really ******* annoying.