Am i too Skinnyy?

My friends have been telling me i have lost a lot of weight latley...im 5'6, 14 yrs. old and 107 pounds. I practice volleyball every day with my hs team yet my thighs cant touch. I dont eat health and feel sleepy all the time. Could it be that im a loosing weight or that is just my bodyy? In my family skinnyness is hereditary...