Re. am i fat i want to loose weight?

i want to loose weight im like 5ft 6 inches in planning to be in athletics and i want to know if there is anyway i can start loosing weight like over the summer we get out of school in 2 weeks and im around 140 but i used to weigh 153 but lost that and weigh 132 so i want to know if ther are any workout vids i can look at online btw im turnning 12 in 5 more days