How to convince my parents to let me wear a bikini?

I am almost 13 and my parents will not let me wear a bikini. They are from india so they are conservative but they let me wear halter tops. They let me wear tankinis but I feel out of place in them. I want to wear a bikini because I want to not be so self conscious and I want to be comfortable in my own skin. I dont want a string bikini. I would prefer some that give more coverage. I wore bikinis when I was like 7 and younger.
I like the amount of coverage in this bikini top-
http://www.kohls.com/kohlsStore/swim/special_sizes/juniors/mix_match/PRD~c25709/SO+Reversible+Swim+Separates.jsp

HOW DO I CONVINCE MY PARENTS TO LET ME WEAR ONE!?!?!?!?!?!

well one thing is for sure about trying to get parents to let you do something-you can't whine and nag them about it. they'll just get tired of it. you have to try to earn responsibility from them and maybe you could help them around the house to get on their good side. best of luck:)