I feel so insecure

I know that I should love myself and my body, but I can't. I have tried really hard. It's just that everytime I look in the mirror I notice all my flaws. Not only that but many girls at my school are absolutely stunning. I hate my chest and butt. I literally don't have boobs (I'm a 34A). And my hips are huge. Not only that but I'm 4'11. Everyone I know is over 5'3. I feel so chubby even though I exercise daily and eat very healthy. I just don't know what to do. I hate my body and as much as I try I can't love it.