The surest way to a thigh gap, regardless of weight, is widened hips.  If you're not quite through puberty, it's possible that your pelvis simply isn't wide enough yet.  Most girls finish developing around the age of 16 or 17, but puberty can continue into the later teens in some cases. .  Try to be patient!  Don't resort to starving.  Puberty involves much growth and change, and you need plenty of nutrients and calories to pull it off.  If you deprive yourself, you will stunt the development of your figure. Accept that puberty takes years, not months.  You might have a sudden growth spurt over a summer, but the physical transition from childhood to adulthood takes years.  Try not to be discouraged if your development is taking longer than other girls you know. If you are 15 and have not menstruated yet, consider seeing a gynecologist .  You might have another health condition that's delaying puberty. If you suspect that your hormones are seriously out of balance, make an appointment with a gynecologist or reproductive endocrinologist.  A simple blood test can tell you a lot about what is wrong, and your doctor can prescribe the appropriate medications from there.
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