Anyone?

Anyone feels so insecure sometimes around other girls? Like I'm the type that's heavy on the top and have less on the bottom.. for some reason I always feel like my boyfriend always takes a glance at girls butts even when I'm around or maybe it's that I am so insecure. Sometimes it gets so bad I'm looking up how to grow my butt & everything. My worse insecurity ever, i literally loose sleep sometimes just thinking..