Need Help weak as water

[TTVShadow]

Okay I really need some help I am very weak and I want to get stronger. I have 2 8 pound weights which I lift. And I do 1 minute planks. But that's it and i could use some help. If you need pictures I will post. I am. 12 years about to turn 13 and I feel like im going to get killed in middle school so I could use some help. Here if you want to know some information about me.i am 89 pounds and my height is 5,2. My bmi is 16.3 just saying im not 49 that's what I put since it might not let me sign up.