You put on your bathing suit and enjoy the fact that you live in a place most people only dream of living. If you're worried about what guys think, stretch marks never turned me off a girl that I liked. You don't want a guy who would care about that anyway. If it's about what girls think, well I'm sure I don't have to tell you that there's no pleasing some people and a lot of girls are that way. Just enjoy the beach and have fun. If you want to trade for the sh*tty Arizona desert I'd be happy to switch with you.