Getting attracted to the opposite sex in adolescence is a normal and natural phenomenon. The female hormone, oestrogen is mainly responsible for the changes in the females while the male hormone testosterone is mainly responsible for the changes in the males. All these changes are highly correlated with sexual development, as during adolescence significant physical changes take place in terms of development of secondary sexual characteristics. Adolescent does want to find out more about the opposite sex which is perfectly healthy and normal. Although you may feel hesitant, you should talk to your parents or to a matured person about any queries you might have. Do not be embarrassed, as everyone; including the elders around you have gone through a similar phase. The more information you collect on sex from authentic sources, the less mysterious the subject will seem to you.