I NEED TO GET RID OF MY MUFFINTOPS!!:(?

Ok so im skinny and i play sports 24/7!! Literally!! Im out playin at 3 in the morning alot!! I have muffin tops!! Im 13, 140 lbs.. BUT im also 5'10! I lose weight alot but my muffin tops never go away!! Im definitly not going through liposuction or anything like that! What do I do?!?