I legit just ate a 6inch meatball sub in 3 minutes. will i get fat?

IM SCARED I WILL GET FAT . cause like i have this gap in my legs/thighs and i dont want to lose the gap. but i dont want to become fat. i feel disgusting right now, but it was SOOOOOOOOOO good. im 14 tomorrow, 5'2 and a half, and 95-96 pounds. AHHHHHHHHHHHHHHHHHHHHHH