Put on a bikini. Have a little confidence, and rock that shit!
I know, pretty crazy, right? We obsess so much on having the "perfect" body, looking "beach ready", blah blah blah, more vain crap. Guess what? If you have a body, you have a bikini body. There's a reason brands make them from size 00 to size 34. Big boobs, little boobs, round butts, flat butts, wide hips, narrow hips, pregnant, thick, curvy, slender, pear, hourglass, square, whatever you are, there's a bikini for your body. Find one you love, that fits, is comfortable, and rock those pieces of fabric like no one before you has!
If you don't feel comfortable in a bikini, that's up to you. Some people just don't like them in general, and that okay, too, but if you do like them, there is no reason why you shouldn't wear one. Don't let anyone tell you that you don't have the "right body" to wear what you feel comfortable in. Wear what you feel good in.
My one, real tip about bikinis is this: make sure it fits right. If it's too small, it won't be flattering and you may have to readjust. If it's too big, you may have to readjust, and it may start to slip when it gets wet, and the last thing you want is a wardrobe malfunction. So just make sure it fits you properly, and you'll be good to go.
Wear what you like. Embrace your body, scars, marks, number on the scale, and all. Wear that bikini if that's what you want, if that's what you like, if that's what you are comfortable in. Wear it if you're 100lbs, 180lbs, 250lbs. Wear it if you have stretchmarks, surgery scars, or birthmarks. Don't worry about other people and their opinions, you just do what works for you.
If anyone says anything negative, well, there's plenty of other scenery to look at, isn't there?