Human being is the most sexual creature on earth. It is found that on average,a human thinks about sex every 20 minutes(consciously or unconsciously). For males,it is around 10 minutes. Also,the younger you are,the hornier you will be!!
Now,your horniness is not a bad thing. Don't feel guilty or hesitant about your sexuality. It is as natural as any other things in life. Take it easy,take sex as fun. As long as your sexual fantasies or activities are not extreme and harmful in nature for you and other,you can enjoy it to the full extent.......... ;-)