hi, nayana,there is nothing to be ashamed of, these sexual temptation is common and it is the sign that u r normal. whatever u r doing is all normal. only thing u have to do is to control your sexual desire a little bit n not to engage in unprotected intercourse with anyone. if u have sexual desire n some arousal then u shud go for masturbation n all that stuff, but keep it limited and dont be engaged in that all time. because sexual desire n felling of orgasm are very liking moments n one wishes it again n again. try to be at safe n secret place before masturbating. another important thing is that u shud not allow all this stuff interrupting your studies or whatever u r doing.