Haw do i keep pubic hair from showing while waring a swimsuite?

Get a bikini or Brazilian wax. They're relatively inexpensive. Or if you can't handle that, just shave your bikini line with a good quality razor for a close shave, just before you go swimming so you have no stubble showing. I wouldn't recommend using depilatory cream because it is a very sensitive area, and the hair is usually quite thick down there.