i had that problem too!!!!!! and i know the feeling! it used to be so embarassing at school - i had the same problem and didnt actually realise i was doing it most of the time!... i guess the main question is why do you actually do it? - eg i sucked my thumb because id always done it, and it was a comfort thing and also it had turned into a habit - i felt empty without it!... well, if this is any help at all, i kinda bullyed myself into stopping it - i decided one day that that was it, i wouldnt do it again, and if i ever got tempted i just squeezed my hands tight till it stopped, and of course pray about it... im not gonna lie - its really hard to stop! but its well worth it in the end ! i hope that was useful