Go to the drug store and get one of those dropper bottles. Cut off the rubber squeezable top and put it over your nipple (it has to be big enough to fit). Leave it on where practical. I know someone who did this and she got good results. Long nipples look very sexy :-). Good luck.
Sigh. Okay, give 'em 'ere. I'll try my best.
Little nipples are hot, dont sweat it.
I don't know if it is possible to make them bigger, but they can be made longer. Sounds like you are looking for something like nipple suction cups. Beware of what you want; I have seen some really strange looking long nipples. You may want to research the down side before trying anything artificial. I doubt you would want to lose any sensation of your nipples.
Look at them in a magnifying mirror with light.
Then you'll be impressed and it won't bother you so much.