Open Question: why does my dad treat me like this?????

ok seriously i know my dad thinks im gonna get pregnant before im sixteen . and then i had to ASK him to put up jonas brothers posters and he said okay and then i did and he say istead of one i put like 20 of them up. and he forced me to take them all down.Im gonna stay virgin to marrige but the worst part is that he doesnt talk about sex with and if i did tell him he would probably get really mad for even bringing up the subject and seriously i wear really decent clothing but b4 i leave the house he always checks from head to toe to see what i wearing and he always tells me to put a scraf on even in the summer so it can cover my chest. even if the shirt makes me look flat?!?! and we went shopping one time and he bought so many things for himself at an outlet mall and he said i could only get one thing. wen i begged for another sweatshirt he got mad and said no. and one time my sister was on disneychannel.com and the jonas brothers. i have an 95 average and my dad expects so much more.