insecurities are holding me back!!!

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ugh i hate my insecurities! my inlaws invited me and my husband on a cruise to the bamamas but im way to self conscious of my body to wear swim clothes in front of them. i dont even have them see my arms because of the stretch marks on them. :( This year my weight got so bad i went up to 264 and got these awful dark red stretch marks all over my arms...and now when ever i see them or go out i make sure to wear long sleeves. ive been putting on creams 2x a day and its SLOWLY getting better but its still really bad. I don't know what they are going to do or say if they see red marks on my arms. And now im going to miss on this amazing vacation because im afraid and hate my body.