How can an overweight teenager look good in a one piece bathing suit?

I am overweight; and I have flabby arms, my legs are curvy but not completely toned and I have stretch marks. I want to know how to look god in my bathing suit. How should I wear my hair, how should I do my makeup, and how to feel confident too. I am going swimming tomorrow so I need to know soon! First greatest answer gets 10 points!